Random chance: The embryo implants on the uterine lining, and at that location the placenta starts to grow. Usually, it is on a portion of the uterus that will stretch and thin during pregnancy, and is nowhere near the internal cervical opening. However, sometimes the embryo implants very near the internal cervical opening, resulting in a low-lying placenta or even a placenta covering the opening, req. C-sec.
Answered 8/21/2019
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A doctor has provided 1 answer
A doctor has provided 1 answer
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