Implantation bleeding may be an early sign of pregnancy for approximately 1/3 of all women who conceive. The fertilized egg travels down the Fallopian tube and into the uterus, where it implants into the uterine lining. When it does, the tissue that forms around the egg, known as the trophoblast, may damage some of the mother's blood vessels in the uterus, resulting in a small amount of blood leaking from the cervix and down the vagina. Learning how to recognize implantation bleeding may be an early clue for some women that pregnancy has begun.
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