the process of implantation begins. By the end of the first week, the blastocyst is superficially attached to the uterine endometrium. By the end of the second week, implantation has completed.

Implantation stages

There are five recognized stages of implantation in mammals, including two pre-implantation stages that precede the formation of the placenta. They are: migration and hatching, pre-contact, attachment, adhesion, and invasion.

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