Implantation of endometrium

[super112]

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Does this happen during the gastrula stage or blastula or blastocyst stage. I think I read gastrula here on sdn, but other sources are saying one of the other two. So I just want to confirm gastrula is right/wrong and if it's blastula or blastocyst (is there a difference)? Thanks!

 

[BYU4you]

Blastocyst is the human form of a blastula which is the point where it implants