Here is what a blighted ovum is:
A blighted ovum (also known as ?anembryonic pregnancy?) happens when a fertilized egg attaches itself to the uterine wall, but the embryo does not develop. Cells develop to form the pregnancy sac, but not the embryo itself. A blighted ovum usually occurs within the first trimester before a woman knows she is pregnant. A high level of chromosome abnormalities usually causes a woman?s body to naturally miscarry.
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