The days between an embryo transfer and the pregnancy test - usually called the two-week wait - are for many people the hardest stretch of an IVF cycle: there are no appointments, no scans, and a running commentary of ambiguous symptoms. This article explains what the phrase covers and why the actual length varies by clinic, what is happening in the body while nothing seems to be happening, why progesterone and other luteal support medication continues through the wait, which symptoms are common and why they cannot be read as a result, what different clinics say about activity, exercise, work and things to avoid, when and how the pregnancy test is done and why clinics ask patients not to test early, and the situations in which the clinic should be called before the test date. It draws on published patient information from Cleveland Clinic, two NHS foundation trusts and several fertility clinics, together with a published review of luteal phase support. Nothing here is a diagnosis or personalised advice, clinic protocols genuinely differ on several of these points, and every individual decision during the two-week wait - from medication to symptoms to the test itself - belongs with the treating clinic and a licensed physician.
What is the two-week wait after an embryo transfer?
Shady Grove Fertility defines the two-week wait as the period between the end of a fertility treatment cycle and the beta hCG blood test, the test that determines whether someone is pregnant, and The Evewell describes it the same way, as the time between embryo transfer and the pregnancy test. The name is approximate rather than literal, because clinics schedule the test at slightly different points. Cleveland Clinic states that a healthcare provider uses a blood test to determine pregnancy approximately nine to 14 days after embryo transfer, and Spring Fertility notes that clinics typically advise testing about nine to 12 days after the transfer rather than exactly 14. Guy's and St Thomas' NHS Foundation Trust counts from a different starting point, telling its patients to take the test 16 days after egg collection. The differences reflect each clinic's own protocol rather than disagreement about the biology, and the date printed on an individual treatment plan is the one that applies. What the phase has in common everywhere is that it sits between two defined events - the transfer and the test - with no scan or measurement scheduled in between, which is part of what makes it feel long. This article walks through what is happening in the body during those days, why hormonal support continues, what symptoms do and do not mean, and what the test at the end involves; what any of it means for one person's cycle is a question for their own clinic.
What happens in your body after the embryo is transferred?
The Evewell describes implantation as generally beginning within one to two days of the transfer and taking around five days to complete. Spring Fertility sketches a similar timeline across the wait: in roughly the first five days the embryo begins the process of implantation and, if successful, attaches to the uterine lining; from around day six to day ten an implanted embryo starts to produce hCG, human chorionic gonadotropin, known as the pregnancy hormone; and around days 11 to 14 the clinic schedules a beta hCG blood test to confirm pregnancy and check that levels are rising appropriately. Cleveland Clinic describes hCG as the hormone that blood pregnancy tests measure, produced by the placenta during pregnancy. None of this is detectable from the outside, which is why the days pass without news. Underneath, the uterine lining has been prepared in advance: a review in Frontiers in Reproductive Health explains that progesterone triggers a chain of events resulting in decidualization of the endometrium and the establishment of endometrial receptivity, allowing an embryo to implant within a narrow time frame the field calls the window of implantation. In other words, much of the biology of the two-week wait is complete within the first week; the remainder of the wait exists because hCG needs time to rise high enough to measure reliably, a point Shady Grove Fertility makes in explaining that it takes roughly two weeks from implantation for hCG levels to become detectable by blood test.
Why do clinics prescribe progesterone during the two-week wait?
A review in Frontiers in Reproductive Health explains the reasoning. In a stimulated IVF cycle, ovarian stimulation can disturb the hormones of the second half of the cycle: the multiple corpora lutea produced by stimulation secrete high amounts of progesterone, which can feed back on the pituitary and cause a premature drop in LH, and the result can be a luteal phase that is shorter than normal or associated with insufficient progesterone, described as a luteal phase defect. The review states that luteal support, mainly progesterone, may promote implantation, and that programmed frozen embryo transfer cycles are non-ovulatory and lack a functioning corpus luteum altogether, so estrogen and progesterone in those cycles come exclusively from medication and support is essential. The same review notes progesterone can be given by vaginal, intramuscular, oral and subcutaneous routes. Cleveland Clinic states that progesterone is added to improve the chances of an embryo implanting and growing, and that most people continue it through the first trimester. Cambridge University Hospitals' patient information lists vaginal, rectal and injectable progesterone preparations alongside oral and patch estrogen, instructs patients to continue all prescribed medication without discontinuing it, and states that support continues until seven weeks after a fresh transfer and 12 weeks after a frozen or donor egg cycle under its protocol. The Evewell adds a specific warning: do not stop progesterone in response to bleeding without clinical advice. What any individual takes, and for how long, is set by their own clinic and prescribing physician.
What symptoms are common during the two-week wait - and what do they mean?
Cleveland Clinic lists the mild symptoms that can follow an embryo transfer: mild bloating and cramping, breast tenderness from high estrogen levels, spotting and constipation. Shady Grove Fertility lists cramping, spotting or light bleeding, abdominal bloating, fatigue and breast tenderness, and is explicit about what they mean: these are normal and do not signify that someone is or is not pregnant. The reason symptoms carry so little information is largely the medication. The Evewell notes that nausea, breast tenderness, bloating, constipation and fatigue during the wait can all be caused by the drugs rather than by pregnancy, and Spring Fertility likewise notes that symptoms may be caused by fertility medications rather than pregnancy itself; Shady Grove Fertility explains that progesterone supplements are continued precisely to produce the same hormone levels that would occur in early pregnancy, which is why medication effects and early pregnancy signs overlap so closely. The absence of symptoms is equally uninformative: The Evewell states that many people feel nothing at all, that this is entirely normal, and that the absence of symptoms does not mean treatment has been unsuccessful, and Spring Fertility repeats the point, that a lack of symptoms is entirely normal and does not mean the treatment has failed. The Evewell's summary is worth holding onto for the whole fortnight: no single symptom reliably predicts a positive result. A symptom that is severe or frightening is different - that is a call to the clinic, not a sign to decode alone.
Is cramping or spotting after embryo transfer normal?
Usually, yes - within limits. The Evewell states that cramping around the time of implantation is common and can feel similar to period pain, and Cleveland Clinic includes mild cramping and spotting among the mild symptoms that can follow a transfer. The Evewell describes three ordinary sources of light spotting during the wait: the transfer procedure itself, the use of vaginal progesterone pessaries, and what is sometimes called implantation bleeding. Shady Grove Fertility likewise lists spotting or light bleeding among normal experiences that do not signify the outcome either way. The important distinction is between light and heavy. The Evewell advises contacting the clinic if bleeding is heavier than the lightest day of a period, and says that heavy bleeding accompanied by severe pain, or feeling unwell, is a reason to contact the clinic urgently or go to the nearest emergency department. Cambridge University Hospitals similarly lists heavy bleeding among its reasons to contact the unit, and Cleveland Clinic lists heavy vaginal bleeding and severe pelvic pain among the reasons to call a provider. Bleeding also does not by itself mean the medication should change: The Evewell is explicit that progesterone should not be stopped in response to bleeding without clinical advice. So cramping and light spotting sit inside the range of normal, heavier bleeding or significant pain is a prompt to call, and in every case the clinic that planned the cycle is the right judge of what an individual bleed means.
What should you avoid during the two-week wait?
Clinic instructions differ more here than anywhere else, which is itself the main lesson. Shady Grove Fertility advises avoiding strenuous physical activity and sexual activity during the first five days after transfer, on the reasoning that they may cause uterine contractions, and also lists foods to avoid that mirror standard early pregnancy advice - sushi and raw meats, high-mercury fish and soft cheeses - along with alcohol. The Evewell recommends avoiding high-impact exercise, heavy lifting, contact sports and intense workouts. Guy's and St Thomas' NHS Foundation Trust, by contrast, tells its patients there is no evidence that anything done at this stage increases the chances of pregnancy, and that having baths or sex does not affect the chances - a genuinely different instruction from Shady Grove's, and a reminder that these are protocol choices rather than settled universal rules. Where the sources converge is on medication: Cambridge University Hospitals instructs patients to continue all prescribed medicines without discontinuing them, and The Evewell warns against stopping progesterone without clinical advice. Spring Fertility adds one more thing to avoid: activities or scenarios that cause additional unnecessary stress. None of this is a licence to assemble a personal rulebook from the strictest line of every clinic's advice; the practical answer is to follow the written instructions of the clinic that performed the transfer, and to put any conflict between what different sources say directly to that clinic or a licensed physician.
Can you exercise, travel and work as normal?
Largely yes, within limits each clinic defines - and none of the sources reviewed for this article prescribes bed rest. Guy's and St Thomas' encourages patients to return to work during the wait, noting that time off is optional and that there is no evidence that behaviour at this stage changes the chances of pregnancy. The Evewell frames its advice as listening to the body rather than complete rest. On exercise, the sources draw the same line in slightly different places. The Evewell considers gentle exercise such as walking, stretching and low-intensity yoga generally safe, while advising against high-impact exercise, heavy lifting, contact sports and intense workouts. Shady Grove Fertility advises avoiding strenuous activity for the first five days and then describes light aerobic activity - yoga, swimming, moderate walking and light weight training - as acceptable, while still advising against high-impact activities such as jogging or aerobics. Spring Fertility notes that gentle activities like walking or yoga can promote relaxation. None of the sources reviewed sets rules about travel, so travel plans that fall inside the wait - including the flights that cross-border patients often face - are worth raising with the clinic when the transfer is scheduled rather than assumed either way. The Evewell's closing advice applies to all of it: anyone with concerns about activity after embryo transfer should speak to their own fertility clinic for personalised advice, and a licensed physician is the right judge of any individual situation.
When should you take a pregnancy test - and why do clinics use a blood test?
On the clinic's date, and not before. Cleveland Clinic states that a healthcare provider uses a blood test approximately nine to 14 days after embryo transfer, measuring hCG, the hormone produced by the placenta. Spring Fertility says clinics typically advise testing about nine to 12 days after transfer and describes the beta hCG blood test as a more accurate measure of early pregnancy than home pregnancy tests, used both to confirm pregnancy and to check that hCG levels are rising appropriately. Guy's and St Thomas' dates the test 16 days after egg collection and asks patients not to test earlier than the date given, because the trigger injection can stay in the bloodstream for eight to ten days. That is also Shady Grove Fertility's reason for advising patients to refrain from home tests during the wait: administered hCG can produce a false positive, and testing before hCG has risen far enough can produce a false negative. The Evewell makes the same two-sided point, that early testing risks a false negative or a misleading result after an hCG trigger injection. Not every clinic tests blood first: Cambridge University Hospitals asks its patients to perform a urine pregnancy test on the first morning sample on the advised date and to contact the unit with the result, and Guy's likewise asks patients to contact the unit with their result. Whichever form the test takes, the date on the individual treatment plan is the one to follow.
When should you contact your clinic during the two-week wait?
For anything urgent, and for anything worrying. Cleveland Clinic lists reasons to call a provider: a fever above 100.5 degrees Fahrenheit (38.05 degrees Celsius), blood in the urine, heavy vaginal bleeding, or severe pelvic pain. Cambridge University Hospitals asks patients to contact the unit for heavy bleeding, a raised temperature or feeling unwell, or abdominal pain not relieved by paracetamol or codeine, and to make contact immediately if a positive pregnancy test is followed by lower abdominal pain or bleeding. The Evewell tells patients to contact the clinic if bleeding is heavier than the lightest day of a period, to report any bleeding after a positive test, and to seek urgent help or attend the nearest emergency department if bleeding is heavy and accompanied by severe pain or feeling unwell. The threshold for a non-urgent call is lower than many patients assume: The Evewell tells its patients they can get in touch before the test date for any reason, and Spring Fertility describes its care team as available throughout the wait for questions about symptoms. The clinic also wants the ending, whatever it is: Guy's and St Thomas' and Cambridge University Hospitals each ask patients to contact the unit with the pregnancy test result itself. Nothing in this article replaces that line to the clinic - a symptom that feels wrong is a reason to call rather than something to sit with, and every decision during the wait belongs with the treating team and a licensed physician.
SOURCES
Sources and review method
Editorially reviewed against the sources below on 22 September 2026. Nothing here is a diagnosis or a personalised recommendation, and what any symptom, medication question or test result means for an individual cycle requires a licensed physician who knows the full medical history of the person concerned.
- Cleveland ClinicIVF (In Vitro Fertilization): Procedure & How It Works
Supports the statements that a healthcare provider uses a blood test to determine whether someone is pregnant approximately nine to 14 days after embryo transfer, that blood tests measure hCG (human chorionic gonadotropin), the hormone produced by the placenta during pregnancy, that progesterone is added to improve the chances of an embryo implanting and growing into a successful pregnancy and that most people continue it throughout the first trimester, that mild symptoms that can be experienced after embryo transfer include mild bloating and cramping, breast tenderness from high estrogen levels, spotting and constipation, and that a provider should be called for a fever above 100.5 degrees Fahrenheit (38.05 degrees Celsius), blood in the urine, heavy vaginal bleeding or severe pelvic pain.
- Guy's and St Thomas' NHS Foundation TrustIVF treatment - Step 5: Embryo transfer to the womb
Supports the statements that this trust tells its patients to take the pregnancy test 16 days after egg collection and asks them not to take it earlier than the date given because the trigger injection can stay in the bloodstream for 8 to 10 days, that it tells patients there is no evidence that anything done at this stage increases the chances of pregnancy, that it encourages patients to return to work while noting that taking time off is optional, that it states having baths or sex does not affect the chances of pregnancy, and that it asks patients to contact the assisted conception unit with the result of the pregnancy test.
- Cambridge University Hospitals NHS Foundation TrustPatient Information after Embryo Transfer
Supports the statements that patients are instructed to continue all prescribed medications without discontinuing them, that the luteal support preparations listed include vaginal progesterone (Utrogestan), rectal or vaginal progesterone pessaries (Cyclogest), subcutaneous progesterone injections (Lubion) and oral estradiol tablets and estradiol patches, that this medication continues until 7 weeks following a fresh embryo transfer and 12 weeks following a frozen embryo transfer or donor egg cycle, that patients are asked to perform a urine pregnancy test on the first morning sample of urine on the date advised and to contact the unit with the result, that the reasons given for contacting the unit are heavy bleeding, a raised temperature or feeling unwell, and abdominal pain not relieved by paracetamol or codeine, and that patients with a positive pregnancy test and lower abdominal pain or bleeding are asked to contact the unit immediately.
- Shady Grove FertilityGetting Through The Two-Week Wait
Supports the statements that the two-week wait is defined as the period between the end of a fertility treatment cycle and the beta hCG blood test that determines whether someone is pregnant, that it takes approximately two weeks from implantation for hCG levels to become detectable by blood test, that most patients need to continue progesterone supplements in order to produce the same levels of hormones that would occur in the early stages of pregnancy, that cramping, spotting or light bleeding, abdominal bloating, fatigue and breast tenderness are normal during the wait and do not signify that someone is or is not pregnant, that patients are advised to refrain from home pregnancy tests because administered hCG can produce a false positive and insufficient hCG levels can produce a false negative, that strenuous physical activity and sexual activity are advised against during the first five days after transfer on the reasoning that they may cause uterine contractions, that foods advised against include sushi, raw meats, high-mercury fish and soft cheeses along with alcohol, and that after five days light aerobic activity such as yoga, swimming, moderate walking and light weight training is described as acceptable while high-impact activities such as jogging or aerobics are advised against.
- The EvewellThe Two-Week Wait After IVF: What to Expect
Supports the statements that the time between embryo transfer and the pregnancy test is known as the two-week wait, that implantation generally begins within one to two days of the transfer and takes around five days to complete, that progesterone should not be stopped in response to bleeding without clinical advice, that cramping around the time of implantation is common and can feel similar to period pain, that light spotting can occur as a result of the transfer procedure itself, from vaginal progesterone pessaries, or as implantation bleeding, that many people feel nothing at all and that this is entirely normal, that the absence of symptoms does not mean treatment has been unsuccessful, that no single symptom reliably predicts a positive result, that nausea, breast tenderness, bloating, constipation and fatigue can all be caused by medication rather than pregnancy, that testing early risks a false negative or a misleading result after an hCG trigger injection, that high-impact exercise, heavy lifting, contact sports and intense workouts are advised against while gentle exercise such as walking, stretching and low-intensity yoga is generally considered safe, that its advice is framed as listening to the body rather than complete rest, that patients are told to contact the clinic if bleeding is heavier than the lightest day of a period, to report any bleeding after a positive test, and to seek urgent help or attend the nearest emergency department if bleeding is heavy and accompanied by severe pain or feeling unwell, that patients with concerns about exercise are told to speak to their fertility clinic for personalised advice, and that patients are told they can contact the clinic before the test date for any reason.
- Spring FertilityThe Two Week Wait: Waiting for Pregnancy Results After IVF
Supports the statements that clinics typically advise testing about 9 to 12 days after the transfer rather than exactly 14, that in roughly the first five days after transfer the embryo begins the process of implantation and, if successful, attaches to the uterine lining, that from around day six to day ten an implanted embryo starts to produce hCG (human chorionic gonadotropin), known as the pregnancy hormone, that around days 11 to 14 the clinic schedules a beta hCG blood test to confirm pregnancy and evaluate whether hCG levels are rising appropriately, that a lack of symptoms is entirely normal and absence of symptoms does not mean the treatment has failed, that symptoms may be caused by fertility medications rather than pregnancy itself, that testing too early can yield inaccurate results and patients are advised to wait for the clinic's beta hCG blood test, which is described as a more accurate measure of early pregnancy than home pregnancy tests, that gentle activities like walking or yoga can promote relaxation, that patients are advised to avoid activities or scenarios that cause additional unnecessary stress, and that the clinic describes its care team as available throughout the wait for questions about symptoms.
- Frontiers in Reproductive Health (PMC)Luteal phase support in fresh and frozen embryo transfers
Supports the statements that controlled ovarian stimulation may result in supernumerary corpora lutea that secrete high amounts of progesterone, which can elicit strong negative feedback on pituitary LH secretion and lead to a premature drop in LH, that the disrupted luteal phase may be shorter than normal or associated with insufficient progesterone levels, termed a luteal phase defect, that luteal support, mainly progesterone, may promote implantation, that progesterone elicits a chain of events resulting in decidualization of the endometrium and the establishment of endometrial receptivity, allowing embryo implantation within a narrow time frame termed the window of implantation, that progesterone can be administered by vaginal, intramuscular, oral and subcutaneous routes, and that programmed frozen embryo transfer cycles are inherently non-ovulatory and lack a functioning corpus luteum, so that the source of estrogen and progesterone in those cycles is exclusively exogenous and there is an essential need for luteal phase support.