How Embryo Implantation Works

This article breaks down embryo implantation and how it works. Here’s a complete guide on what the process looks like.

Embryo implantation is a required part of your surrogacy journey. After an embryo is transferred to your uterus, it either will or will not implant or attach itself to the uterine lining.

After the embryo transfer process is complete, there may be a whirlwind of emotions as you wait to find out if you are pregnant. This article will give you insight into what takes place inside your body in order for a pregnancy to occur.

We’ll walk you through the entire implantation process after the embryo transfer that puts you one step closer to a pregnancy and changing lives.

Contact us today to get more free information about the embryo transfer implantation process. 

What Is Embryo Implantation?

Embryo implantation is the process by which the embryos of the intended parents are transferred to your uterus through a frozen embryo transfer.

A successful embryo implantation needs a competent blastocyst embryo to interact with a receptive uterine lining. A blastocyst is a cluster of dividing cells made by a fertilized egg that form early in a pregnancy, anywhere from 1-5 days after a sperm fertilizes the egg. 

How Long After Embryo Transfer Does Implantation Occur?

Once a blastocyst hatches out of its shell, the implantation process after the embryo transfer includes the blastocyst implanting on your uterine wall, where it will develop into an embryo and then a fetus, begins within a day and finishes in around nine days if it’s successful.

It can take up to 9-14 days after the transfer for embryo implantation to be complete. This is known as “the two-week wait.” During this time, you should avoid taking pregnancy test, as it may not be accurate. 

Here’s what’s happening in your body during this time:

Implantation Process After Embryo Transfer [A Timeline]

Day 1 and 2

A blastocyst hatches and attempts to attach itself to the uterine line. These separating and dividing cells that make up the blastocyst eventually become the structures that encourage the growth of and protect a developing fetus. 

Day 3

The blastocyst continues moving deeper into the uterine lining as implantation begins.

Day 4 and 5

The process of implantation after the embryo transfer wraps up. The cells that will form the placenta and fetus begin to develop at this stage.

Day 6

hCG the hormone that is an indicator of a pregnancy begins to be produced.

Day 7 and 8

hCG the hormone that is an indicator of a pregnancy begins to be produced.

Day 9

hCG levels become high enough to detect a pregnancy.

Your embryologist could also recommend a fresh embryo transfer if they feel the embryo(s) would benefit from developing in the uterus. Fresh embryos can be transferred around the third day if there aren’t as many high-quality embryos to choose from.

Common Symptoms After Embryo Implantation

Although the symptoms of embryo implantation described below can be bothersome, it’s also a positive indicator that the transfer worked.

If you don’t experience the symptoms discussed, that’s OK, as many as 10-15% of patients experience no symptoms at all.   It’s common to have mild or no symptoms at all after your embryo transfer implantation process.


Spotting, or bleeding, after an embryo transfer implantation process is common and can be an indicator of pregnancy. Spotting is typical for natural and IVF pregnancies.  

Lower Back Pain

This is another positive sign that the embryo implantation was successful. Similar to menstrual cycle symptoms, lower back pain and cramping are results of the hormones, ovarian stimulation and endometrial preparation for the embryo transfer process.

Contact Us Today

Surrogacy is a life-changing journey and the transfer process along with the embryo implantation can seem overwhelming at first glance. You’re not alone.

We’ll be by your side at each and every step of the process to walk you through what’s going on and what to expect.

Get in touch with us today to learn more about the process of implantation after the embryo transfer and get the support you deserve.