What Is Implantation?

By Bailey Miller
Reviewed by Alyssa Quimby, M.D.
May 14, 2024

Implantation is the process of a fertilized egg attaching to the uterine lining.

After an egg is fertilized, it will move through the fallopian tubes and eventually attach to the uterine lining. This implantation is the process that allows your embryo to begin to grow in the uterus. It typically happens about 10 days after fertilization.

Implantation may cause some light spotting, called implantation bleeding, which may be an early sign of pregnancy.