What Happens on Embryo Transfer Day in Surrogacy?

On embryo transfer day, the transfer itself is actually pretty brief: The embryology lab warms and checks the selected embryo, the fertility physician places it in the surrogate's uterus, and the care team explains what happens next. What shapes the day is everything decided before it: which embryo, which clinic and lab, the travel plan, who hears the lab update, and how everyone will handle the wait for a pregnancy test. At Les Petits, we think of transfer day as the place where a hundred little decisions meet. Here is what happens, step by step, and the small things that make it go smoothly.

Why does embryo transfer day feel so big?

Transfer day can hold excitement, nerves and hope all at once because it's where months of planning become one moment. The surrogate has prepared her body for transfer with her fertility team. The intended parents have made decisions about their embryos and the family they hope to build. Behind the scenes, the lab and physician have coordinated which embryo will be transferred and when.

The little decisions that meet on transfer day

Transfer day, while only one appointment, is the culmination of many different steps and decisions:

The embryo. Which embryo is transferred was shaped long before matching, by how embryos were created, evaluated and frozen.
The clinic and lab. How a lab warms, assesses, and tracks embryos is part of the result, not a background detail.
The surrogate's preparation. Her medication protocol prepares her uterine lining, and the lab's work is often timed to her transfer appointment.
The travel plan. Arriving rested and on time protects a schedule the lab and physician have built around her.
The communication plan. Deciding who shares the lab update, and when, means no one is left wondering.

None of these feel big on their own. Together, they decide how calm, clear, and well-supported the day feels.

What happens in the embryology lab on transfer day?

If a frozen embryo is being used, the embryologist warms it and assesses whether it's suitable for transfer. Many embryos are frozen by vitrification, a rapid-freezing method that uses protective solutions to help prevent damaging ice crystals from forming. The warming method depends on how the embryo was frozen.

With an embryologist on staff at Les Petits, we pay especially close attention to this step and have a strong point of view around how this is done. In the lab, a few quiet steps matter:

Identity checks. Embryos are labeled and handled through the lab's identification and witnessing procedures. Many labs use electronic witnessing to help document the chain of custody; the system varies by clinic.
Warming. The embryologist warms the embryo using the protocol that matches how it was frozen. Speed matters here: the first warming step happens very quickly, because rapid warming helps protect the embryo from ice crystal damage.
Assessment. The embryologist checks whether the embryo survived warming and is suitable for transfer.
Coordination with the physician. The lab and physician confirm the embryo is ready before the surrogate's transfer begins.

Most embryos survive freezing and warming, but survival isn't guaranteed. The clinic should explain how and when it will share the lab update, and what happens if the selected embryo isn't suitable for transfer.

Questions to ask the clinic before transfer day

Les Petits believes that small questions can have a big impact. That's why we ask so many questions upfront - to keep a hard moment from also becoming a confusing one.

Who will tell us how the embryo looks after warming?
When should we expect that update?
If the plan changes, who will explain our options?

Can intended parents be in the room for the embryo transfer?

Often, yes. Les Petits encourages intended parents to be present when possible. Whether they can be in the room depends on the clinic's policy, the surrogate's preferences, and the size of the room as some rooms fit only a few people.

We'd rather everyone agree on this in advance than find out at the clinic door. The same conversation covers the other little things: if someone can't attend, who sends updates and when, and how everyone feels about photos and sharing the moment.

What happens during the embryo transfer procedure?

The physician gently passes a thin catheter through the surrogate's cervix and places the embryo in the uterus with a small amount of fluid. The transfer is typically done under ultrasound guidance, and tiny bubbles on the screen show where the embryo has been placed.

For the surrogate, the intended parents and the team who have worked toward this day, that brief moment can carry a great deal of feeling. Often, there isn't a dry eye in the room.

The clinic explains its own procedure and aftercare instructions. Those instructions guide the surrogate's activity, medication and follow-up.

How long does the embryo transfer take?

The transfer itself usually takes 15 minutes or less. Clinics often schedule the appointment for around an hour, which leaves time for check-in, confirming the surrogate's and embryo's identity, and a short rest afterward.

Many clinics ask the surrogate to arrive with a comfortably full bladder. It's a small instruction with a clear purpose: a full bladder helps the physician see the uterus more clearly on ultrasound.

How does Les Petits help surrogates and intended parents prepare for transfer day?

Preparation starts well before the appointment, and it's built from details that are easy to overlook until they're missing.

Travel that protects the timing

In a typical Les Petits travel plan, the surrogate arrives in town the day before, with her hotel and transportation arranged and a companion by her side. There may be time for dinner and a quiet evening before the appointment.

That extra night is a small decision with a real purpose. The lab's warming is often timed to her appointment, so an unhurried arrival means she isn't racing traffic or a delayed flight on the morning it matters. Details vary by journey and by the clinic's instructions.

Leaving the clinic with everything she needs

Before the surrogate leaves the clinic, we want her to have:

Her medication calendar and any needed refills
Her follow-up instructions and next appointment
A clear way to reach her care team

A missing refill can turn into a worried phone call on a weekend. Checking for it on transfer day is one of those little things that keeps the next two weeks steady.

Knowing who to call, at any hour

Questions don't only come up between 9 and 5. Before transfer, the surrogate should know who to call with a medical question and how to reach Les Petits for journey support. We keep communication open among the surrogate, the intended parents, Rebecca and Shane, so the clinical and human sides of the journey stay connected.

What happens after the embryo transfer?

The surrogate follows the fertility clinic's aftercare and travel instructions. In many journeys, the surrogate and her companion travel home within 24 to 48 hours. That reflects common arrangements, but is not a hard rule for every clinic or patient.

Can a surrogate exercise or be active after embryo transfer?

Yes, within the limits her clinic sets. Strict bed rest isn't needed: a Cochrane review found no clear evidence that more bed rest after transfer improves pregnancy rates.

Most clinics suggest taking it easy on transfer day, then easing back into normal routines. Common guidance includes:

Gentle movement, like walking, is generally encouraged
Skip strenuous or high-impact exercise and heavy lifting until the clinic says otherwise
Avoid overheating, such as hot tubs, saunas and hot yoga
Ask the clinic about intercourse before the pregnancy test

"Take it easy" can mean different things to different people. Going over the clinic's aftercare sheet before she leaves makes sure it means the same thing to her, her family and the intended parents.

Can a surrogate fly after embryo transfer?

Usually, yes. A 2025 study of more than 2,100 embryo transfers found no significant difference in pregnancy, implantation or miscarriage rates between patients who flew after transfer and those who didn't. The researchers looked back at past records and have called for further studies, so the clinic's travel guidance still comes first.

A few small travel details make the trip home easier:

Pack all medications in a carry-on bag, not checked luggage
Drink water throughout the trip
On longer flights, get up and walk around
Know which number to call if a question comes up on the road
Sometimes a special blanket may be provided for air travel by the IVF clinic

Are there diet restrictions before or after embryo transfer?

There's no special embryo transfer diet. Always confirm with the clinic but most clinics ask surrogates to eat as if they're already pregnant from the start of the medication cycle.

No alcohol after transfer, and many clinics advise avoiding it throughout the cycle
Keep caffeine moderate. ACOG's pregnancy guidance is less than 200 mg of caffeine a day
Follow standard pregnancy food safety: avoid high-mercury fish, sushi or raw fish, unpasteurized dairy, deli meats that haven't been heated, and raw or undercooked meat and eggs
Keep taking prenatal vitamins, and check with the clinic before starting any herbal supplement

In surrogacy, lifestyle expectations like these are often written into the surrogacy agreement too. Talking them through during matching, rather than in the transfer-day waiting room, keeps everyone on the same page long before it matters.

Agree on home pregnancy testing before transfer

This is one of the smallest conversations in the whole journey, and one of the most useful. Before transfer, we'll talk through:

Does the surrogate plan to use a home pregnancy test?
If so, who wants to hear about it, and how?
What happens if a home result is unclear?

Having this conversation before emotions run high helps protect the relationship between surrogate and intended parents, whatever the wait brings.

The beta hCG test and medication

The clinic schedules the formal blood pregnancy test, often called a beta hCG test. A home result doesn't replace the clinic's test or its instructions. The surrogate should not stop or change prescribed medication unless her fertility clinic tells her to, whatever a home test shows.

Transfer day ends with a little more hope and another stretch of waiting. Knowing the next step, the next update and who is there to help makes that wait feel less uncertain.

Frequently asked questions about embryo transfer day

How long does it take to warm a frozen embryo?

It depends on the lab's method. Warming, assessing the embryo and preparing it for transfer are separate steps. Ask your clinic when to expect the lab update rather than planning around a universal time estimate.

Does every embryo survive warming?

No. Most survive, but some don't. Your clinic can explain how it assesses the embryo and what your agreed next steps are if the plan changes.

Can intended parents attend the embryo transfer?

Often, depending on the clinic's policy, the room's size and the surrogate's preferences. Agree on attendance and updates before transfer day.

When will we know whether the transfer worked?

Your fertility clinic will give you the date for the formal blood pregnancy test (beta hCG). Keep following the clinic's medication and care instructions while you wait. A home test shouldn't be used to decide whether to change treatment.

What should surrogates and intended parents agree on before transfer day?

Confirm who will attend, who will receive the lab and clinic updates, the travel plan, the medication and follow-up schedule, and how everyone wants to handle home testing.

How long does an embryo transfer take?

The transfer itself usually takes 15 minutes or less. Plan for the appointment to take about an hour, including check-in, identity confirmation and a short rest afterward.

Can a surrogate fly home after embryo transfer?

Usually, yes. Current research hasn't found that flying after transfer lowers pregnancy rates. Follow your clinic's travel guidance, drink plenty of water and get up to walk on longer flights.

Planning your next step

Your embryo plan, your clinic's instructions and your communication preferences all shape transfer day. Talk with Les Petits about the questions you want answered before your journey moves forward. If you're still planning embryos, read How Many Embryos Do You Need Before Starting Surrogacy?