Implantation first: The embryo implants into the uterus before a woman has a positive pregnancy test. Before implantation, any bHCG from the embryo does not get into the woman's blood, because the embryo is not connected to the woman. Implantation is the process of connecting the embryo to the woman. Once the embryo is implanted, bHCG from the embryo can now get into the woman's blood and cause a positive preg. test.
Answered 3/31/2016
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