5-6 days: An embryo goes through certain stages over the first 4 days that prepare it to enter the uterus. There is becomes a blastocyst on day 5 or 6 and has the ability to stick and implant in the uterus. After that it has integrated into the blood supply of the uterus. If it does not implant it stops growing.
Answered 6/6/2015
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