Immediately: As soon as the developing embryo is implanted in the uterus and the placenta begins development.
Answered 2/4/2012
6.2k views
4-5 days: About 4-5 days after the sperm and egg meet (conception), the fertilized egg implants in the uterine lining and begins placenta development. The placenta is very functional by 12 weeks.
Answered 9/11/2019
5.6k views
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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