Blog post
Dec 4, 2025
You have just left the clinic. Your embryo transfer has gone well, and your embryo is now “home.” But as soon as you step outside, the initial excitement may begin to give way to uncertainty. The so-called two-week wait begins.
We know these days can feel even harder than the injections themselves. Every symptom, or the absence of one, can become a source of worry. In this article, we want to help you find reassurance by understanding what is happening in your body and what the science tells us.
We explain what happens in your uterus, which symptoms are normal during the two-week wait, and what you should (and should not) do during this time.
The two-week wait is the period of approximately 10–14 days between embryo transfer and the blood test used to measure the pregnancy hormone beta-hCG. This is the time needed for the embryo to produce enough beta-hCG after implantation for the hormone to be detectable in the blood.
Your medical team will tell you the exact date of your blood test. After in vitro fertilisation (IVF) or egg donation treatment, the waiting period is counted from the day of embryo transfer and depends mainly on the embryo’s age. A 5-day blastocyst begins producing hCG earlier than a 3-day embryo, so the beta-hCG test is usually performed a little sooner. Whether the embryo is fresh or frozen does not change this principle: what matters is the embryo’s age at the time of transfer. After intrauterine insemination (IUI), the waiting period is counted from the day of insemination and is usually a little longer, around 14 days, because fertilisation still needs to take place inside the body.
While you wait, two processes take place in your uterus at the same time: progesterone helps maintain the endometrium in a suitable condition, and the embryo begins to implant. Here is how the process unfolds, step by step.
For a pregnancy to begin, the environment needs to be ready.
What is a Receptive Endometrium? The endometrium is the tissue lining the inside of the uterus and plays a key role in embryo implantation.
During endometrial preparation, a thickness of at least 7 mm and a trilaminar appearance are generally considered favourable features, although neither is an absolute requirement for pregnancy. Endometrial receptivity also depends on other factors, including the hormonal balance and synchronisation with the embryo’s development. The Window of Implantation: the uterus is not always at the optimal stage to receive an embryo. There is a limited period known as the implantation window, when the endometrium is best prepared to support implantation. At Institut Marquès, we coordinate embryo transfers with the timing considered most appropriate for each individual case.
It is the biological process that defines success, but it is silent and invisible.
Definition: implantation is the process during which the blastocyst, an advanced stage of embryo development, emerges from the zona pellucida, attaches to the endometrium and begins to embed itself in the uterine lining, initiating the process of placental formation.
When does it happen? Implantation is not instantaneous. It usually begins within 24–48 hours after the transfer of a blastocyst. This is why strict bed rest is not necessary: the embryo needs time to begin interacting with the maternal body.
If a 3-day embryo is transferred, it must continue dividing until it reaches the blastocyst stage inside the uterus. Implantation therefore begins a few days later. You can see how an embryo develops day by day in this article" your embryo's 5-day journey from zygote to blastocyst."
If we count the day of transfer as day 0, this is what usually happens after a 5-day blastocyst transfer. Every embryo develops at its own pace, so use this as a general guide rather than an exact timetable:
Symptoms can be misleading. During the two-week wait, it is normal to pay attention to every little sensation in your body. At this stage, we encourage you to trust the science.
The most common symptoms during this period include:
No. Having no symptoms is very common both in cycles with a positive beta-hCG result and in those with a negative result. Likewise, symptoms appearing and disappearing from one day to the next do not mean anything on their own. This is usually related to hormonal fluctuations and the effects of progesterone. The only reliable way to know the outcome is to take the beta-hCG test.
Many patients with a positive beta-hCG result remember experiencing twinges, breast tenderness or tiredness. However, patients with a negative result often describe exactly the same sensations, and many patients with a positive result have felt nothing at all. No symptom can confirm pregnancy before the blood test. Typical pregnancy symptoms, such as nausea, usually appear later, around the fifth or sixth week of pregnancy, counted from the last menstrual period, that is, after the beta-hCG test.
The progesterone prescribed by your medical team, whether as vaginal pessaries, gel, injections or tablets, prepares and maintains the endometrium. Its side effects can be very similar to early pregnancy symptoms: bloating, breast tenderness, sleepiness, constipation, mood swings and, when used vaginally, increased discharge. For this reason, these symptoms cannot predict the outcome.
If you use vaginal pessaries, it is normal for some of the product’s inactive ingredients to come out with your discharge. This does not mean the medication has failed to work or that you need to repeat the dose. If you are unsure, speak to your medical team before making any changes to your treatment.
It is common to experience discomfort similar to period pain, whether or not pregnancy occurs. While you are taking progesterone, your period will usually be delayed, even if the beta-hCG result is negative. Therefore, bleeding during the two-week wait does not, by itself, confirm that treatment has been unsuccessful. Do not stop your medication, and take your beta-hCG test on the scheduled date. If the bleeding is heavy or accompanied by severe pain, contact your medical team.
Noticing a small spot of blood during the two-week wait can be worrying. However, it does not always mean that something is wrong.
What is implantation bleeding? This term is used to describe light spotting that may occur in early pregnancy. It is sometimes attributed to implantation, but the appearance of the bleeding cannot confirm its cause or prove that implantation has occurred.
This does not happen to every woman, but if it happens to you, do not stop your medication. Breathe deeply. It is often the physical sign that the nesting process is taking place.
How can you tell it apart from your period? Light spotting sometimes associated with implantation is usually scant, pink or brown, short-lived and does not become heavier. If the bleeding is bright red and heavy, similar to a period, or accompanied by severe pain, contact your medical team. It does not necessarily mean that treatment has failed, but it should be assessed.
The list of restrictions is short. Your embryo will not “fall out” when you stand up, bend down, cough or go to the toilet. You can work, walk and continue with your usual daily activities. During the two-week wait, it is best to avoid:
This is a question we are often asked. The honest answer is that implantation depends on the embryo and the endometrium, not on what you do or do not do on a particular day. What you can do is simple: follow your prescribed treatment, eat a balanced diet, avoid smoking and alcohol, and stay moderately active. Strict bed rest does not help, and some studies suggest that it may even be counterproductive. There is no evidence that eating pineapple, taking supplements beyond those prescribed by your doctor, or keeping your feet warm makes a difference. You do not need to blame yourself for anything you have or have not done.
Work, travelling home, climbing stairs and sexual intercourse
You can generally continue working as usual, and in most cases, you do not need to take sick leave. Travelling by car or plane does not affect implantation either, so you can fly home after your embryo transfer in Barcelona. Climbing stairs, walking and moving around gently are all fine. Avoid intense exercise and high-impact sports during the first few days, and ask your medical team when you can resume all your usual activities. When it comes to sexual intercourse, ask your doctor for advice. They will let you know whether, in your particular case, it is better to wait until your beta-hCG result is available.
We know the temptation to take a home urine test is enormous. We ask for patience for a medical reason.
What is Beta-hCG? Beta-hCG is the hormone that begins to be produced after implantation. While you wait for your blood test, it helps to know when the test is performed, how to interpret the result and what happens after a positive result.
Until the day comes, it helps to know when and how the test is done and what happens after a positive result.
Why is it important to wait until the recommended date? A blood test measuring beta-hCG detects the pregnancy hormone and is used to confirm the outcome of fertility treatment on the date recommended by your clinic.
Have your blood test on the date recommended by your medical team, based on the embryo’s age at the time of transfer. If you have returned home after your transfer, you can have a quantitative beta-hCG blood test at a nearby laboratory and send the results to your medical team. If you decide to take a home urine pregnancy test beforehand, remember that a negative result is not definitive and is not a reason to stop your medication.
If your result is positive, the blood test is usually repeated two or three days later to check how your beta-hCG levels are changing. A few weeks later, your first ultrasound will be performed to check for the gestational sac. Your medical team will tell you how many follow-up tests you need. Each laboratory has its own reference ranges, so your team will explain how to interpret your results. Avoid comparing your numbers with those of other patients.
The waiting period can feel harder than the treatment itself. These ideas may help you cope:
If anxiety is preventing you from sleeping or working, you do not have to face it alone. Our fertility psychology service offers emotional support at every stage of treatment, including the two-week wait.
Some patients also choose acupuncture in the days before and after embryo transfer to help them relax. This is a complementary service that you can discuss with your doctor.
Sometimes, even after transferring an embryo with good characteristics, cultured using our Time-Lapse technology, pregnancy does not occur. At Institut Marquès, we assess each case to explore possible causes and determine whether the treatment strategy should be adjusted.
Definition: implantation failure. Implantation failure refers to a situation in which pregnancy has not been achieved after several transfers of good-quality embryos. Therefore, a single negative result does not necessarily mean that implantation failure has occurred.
A negative beta-hCG result can be painful, and it is normal to need a few days before thinking about the next step. Your doctor will then review the treatment cycle with you and explain the available options. These may include transferring any frozen embryos you have or investigating why implantation did not occur before trying another treatment cycle.
At Institut Marquès, we support you throughout your treatment, including during the two-week wait. If you are considering starting treatment or would like a second opinion, request your free first visit or explore our treatment prices.
These are some of the questions our patients ask most often during the waiting period. If you have another question, your medical team is available to help at any time.
Each laboratory has its own reference ranges, and your medical team will explain which level they consider positive. In addition to the initial result, it is important to assess how beta-hCG levels change in the second blood test, which is usually performed two or three days later.
Progesterone helps prepare and maintain the endometrium to support pregnancy. This hormonal support is essential in many assisted reproduction treatments. It is therefore very important not to stop your medication without medical advice.
Progesterone is essential to maintain the uterine lining. Without this support, the embryo could not implant or stay attached. Never stop your medication unless your doctor tells you to; if the beta is positive, you will usually keep taking it for some weeks.
Usually none that you can tell apart from the effects of progesterone; at most, light spotting or period-like cramping. Many women notice nothing at all during implantation, so the only reliable sign is a positive beta-hCG blood test.
Implantation of a blastocyst usually begins between 24 and 48 hours after the transfer and is completed over the following days. That is why bed rest is not necessary: the embryo needs time to start the chemical dialogue with the uterus.
About 10 to 14 days from the embryo transfer. After a day 5 blastocyst the beta is usually scheduled a little earlier than after a day 3 embryo, and after an IUI the wait is about 14 days. Your team will tell you the exact date.
The worry of the wait is normal, and research has not shown that it lowers your chances: a large analysis of studies in women having fertility treatment found that emotional distress before treatment did not reduce the chance of pregnancy. Looking after yourself is still worthwhile, because it makes the wait easier to bear.
Nothing in normal daily life: walking, working, laughing, coughing or going to the toilet will not dislodge the embryo. What you can control is taking your medication as prescribed and avoiding smoking, alcohol and medicines your doctor has not approved. When implantation fails, the cause is usually in the embryo or the endometrium, not in something you did.
Each laboratory has its own reference values, and your team will tell you above what level they consider the result positive. More than a single number, what matters is that the beta rises in the second test, which is usually done two or three days later.
It can be. A low first beta does not rule out an ongoing pregnancy: what matters is how it rises in the second test and what the ultrasound shows later. Your team will explain what your specific figure means.
Implantation bleeding is light spotting, pink or brown, that is short and does not get heavier. A period is red and heavier. While you are taking progesterone your period is usually delayed, so if you bleed do not stop your medication, and contact your team if it is heavy or comes with severe pain.
