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The fertilized egg enters the uterus as a 2- to 8-cell embryo and freely floats in the endometrial cavity about 4-7 days after conception. Most embryos implant when the embryo consists of many cells. This happens, on average, six days after conception. The new embryo then induces the lining changes of the endometrium. It then rapidly begins to develop the physiologic changes that establish maternal-placental exchange. Prior to this time, medications ingested by the mother typically do not affect a pregnancy. |
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