Frozen Embryo Transfer (FET): What to Expect, Step by Step

Preparing for a frozen embryo transfer? Learn how your uterine lining is prepared, what happens on transfer day, and how to navigate the two-week wait with confidence.

If you have embryos frozen from an IVF cycle, the next chapter of your journey is the frozen embryo transfer, or FET. For many patients, this is the moment everything has been building toward, and it is natural to feel a mix of hope and nerves.

The good news: an FET is one of the gentler parts of fertility treatment. There are no egg-retrieval injections, no anesthesia for the transfer itself, and the procedure usually takes just a few minutes. Below, we walk through each step so you know exactly what to expect.

What Is a Frozen Embryo Transfer?

A frozen embryo transfer places an embryo that was created during IVF and preserved by vitrification (rapid freezing) into the uterus. The embryo is warmed in the lab on transfer day and gently placed in the uterus at the moment the lining is best prepared to receive it.

FETs are now a routine part of IVF care. Freezing embryos can give your body time to recover after ovarian stimulation, allow time for preimplantation genetic testing results to come back, and let you plan your transfer around work, travel, and life. Any remaining embryos can stay frozen for future siblings.

Fresh vs. Frozen Embryo Transfer

In a fresh transfer, the embryo is placed a few days after egg retrieval, in the same cycle. In a frozen transfer, the embryo is stored and transferred in a later cycle, once the uterus has been prepared on its own schedule.

There is no single right answer for everyone. Your doctor will recommend fresh or frozen based on your hormone levels after stimulation, whether genetic testing is planned, your medical history, and your personal timeline.

The Frozen Embryo Transfer Process, Step by Step

Most FET cycles take several weeks from the start of lining preparation to your pregnancy test, depending on your protocol. Here is what happens at each stage.

1. Preparing the Uterine Lining

The embryo needs a receptive "home." Most of the FET cycle is about preparing the endometrium, the lining of the uterus, so it is ready at the right time. There are two main approaches.

Medicated (programmed) cycle. You take estrogen, usually as pills, patches, or injections, for roughly two weeks to build the lining. This approach gives the care team precise control over timing, which makes scheduling easier.

Natural or modified natural cycle. Your own ovulation prepares the lining. The team tracks your cycle with ultrasound and bloodwork, sometimes using a trigger shot to time ovulation precisely. This can mean fewer medications, but it requires regular cycles and more flexible scheduling.

In either approach, you will have monitoring visits with a transvaginal ultrasound to measure the thickness and pattern of the lining, plus blood tests to check hormone levels. Curious about the science of a receptive lining? Read our guide to endometrial receptivity and the window of implantation.

2. Starting Progesterone and Timing the Transfer

Once the lining is ready, progesterone is added. Progesterone transforms the lining into a state that can welcome an embryo, and it opens what is called the window of implantation.

Timing matters here. The transfer is scheduled so the embryo's developmental stage matches the number of days you have been on progesterone. For a day-5 blastocyst, for example, the transfer typically happens on a specific day of progesterone that your doctor will set.

Progesterone can be given as vaginal suppositories or gels, intramuscular injections, or a combination. Your team will teach you exactly how and when to take it. Taking every dose on time is one of the most important things you can do during this cycle.

3. Warming the Embryo

On the morning of your transfer, the embryology team warms your embryo in the lab and confirms it has survived the thaw and is ready for transfer. Your clinic will let you know how the thaw went.

If you are deciding how many embryos to transfer, this is a conversation to have with your doctor well before transfer day. Many fertility specialists recommend transferring a single embryo to lower the risks that come with twins, but the best choice depends on your age, embryo quality, and history.

4. Transfer Day: What Happens During the Procedure

The transfer itself is quick, usually about 5 to 15 minutes, and most patients describe it as similar to a Pap smear. Here is what typically happens:

1. Arrive with a comfortably full bladder if your clinic asks. This helps the doctor see the uterus clearly on an abdominal ultrasound.

2. The doctor places a speculum and gently cleans the cervix.

3. A very thin, soft catheter carrying the embryo is guided through the cervix into the uterus under ultrasound guidance.

4. The embryo is released into the ideal spot in the uterus. You may see a tiny flash of light on the ultrasound screen as it is placed, a moment many patients find unforgettable.

5. The embryologist checks the catheter under the microscope to confirm the embryo was transferred.

Anesthesia is not usually needed. You can rest briefly afterward, then head home the same day.

5. After the Transfer

You will continue your estrogen and progesterone exactly as prescribed. Never stop or change your medications without talking to your care team first.

Most people return to light, everyday activities soon after the transfer. Strict bed rest is generally not recommended. Your doctor may advise avoiding strenuous exercise, hot tubs, and saunas until your pregnancy test. Mild cramping and light spotting can be normal in the days after a transfer.

Call your clinic right away if you have severe abdominal pain, heavy bleeding, a fever, or anything that worries you.

6. The Two-Week Wait

The days between your transfer and your pregnancy test are often called the two-week wait, and for many patients they are the hardest part emotionally.

Your pregnancy blood test, which measures the hormone hCG, is usually scheduled roughly 9 to 14 days after the transfer, depending on your clinic and the embryo's stage. Home pregnancy tests taken too early can be misleading, and any trigger shot you received may cause a false positive.

Progesterone itself can cause breast tenderness, bloating, fatigue, and mood changes, so these symptoms are not a reliable sign either way. A few things that can help:

• Plan gentle distractions: a show, a walk, time with people who lift you up.

• Decide in advance who you will share your results with.

• Lean on your partner, a trusted friend, a support group, or a counselor.

• Keep your appointments and take your medications on schedule.

Planning Your Frozen Embryo Transfer in Beverly Hills

Every FET plan is personal. At the Center for Reproductive Health & Gynecology in Beverly Hills, Dr. Sam Najmabadi and our team tailor each step, from lining preparation to transfer day, to your body and your goals. Learn more about our frozen embryo transfer process and IVF process.

Ready to talk about your next step? Contact us or call (310) 360-7584 to schedule a consultation.

FAQs

• 1: Does a frozen embryo transfer hurt?

  Most patients feel only mild pressure or cramping, similar to a Pap smear. A full bladder can feel uncomfortable, but the procedure is brief and anesthesia is not usually needed.

• 2: Do I need bed rest after the transfer?

  Generally, no. Light, everyday activity is usually encouraged after a frozen embryo transfer. Your doctor may advise avoiding strenuous exercise, hot tubs, and saunas until your pregnancy test, so follow your care team's specific instructions.

• 3: Can I travel after my FET?

  Short, low-stress travel is often fine, but check with your care team first, especially for flights or trips close to your pregnancy test date. Plan ahead so you can take every medication dose on schedule while you are away.

• 4: How long can embryos stay frozen?

  Embryos preserved by vitrification can be stored for many years. Your clinic can explain its storage options and fees and help you plan the timing of future transfers.

• 5: How soon after a frozen embryo transfer can I take a pregnancy test?

  Clinics usually schedule a blood pregnancy test, which measures the hormone hCG, roughly 9 to 14 days after the transfer, depending on the clinic and the embryo's stage. Home tests taken earlier can give misleading results, and a recent trigger shot can cause a false positive, so it is best to wait for your scheduled blood test.

• 6: Is a frozen embryo transfer better than a fresh transfer?

  Neither is better for everyone. A frozen transfer lets your body recover from ovarian stimulation, allows time for genetic testing results, and gives you more control over timing. A fresh transfer avoids a separate cycle. Your doctor will recommend the approach that best fits your hormone levels, history, and goals.

References

• American Society for Reproductive Medicine (ASRM). In Vitro Fertilization Treatment Journey. ReproductiveFacts.org.

• American Society for Reproductive Medicine (ASRM). (2023). Why would I choose to have elective single-embryo transfer (eSET)? ReproductiveFacts.org.

• Practice Committees of the ASRM and SART. (2021). Guidance on the limits to the number of embryos to transfer: a committee opinion. Fertility and Sterility, 116(3).

• University of Washington Medical Center. Embryo Transfer: How to prepare and what to expect. UW Medicine Health Online.

This article is educational content, not personal medical advice. Please consult your physician about your individual situation.