Implantation Bleeding

Implantation bleeding is vaginal discharge which usually contains a small amount of pinkish or brownish blood. Only about a third of pregnant women experience implantation bleeding. The egg becomes fertilized with a sperm within 12 hours after ovulation, usually in the outer portion of the fallopian tube. It then travels down the fallopian tube, increasing its size along the way. In the fallopian tube it becomes the zygote and doubles to two cells, four cells, then eight cells and becomes the "morula." As the morula enters the uterine cavity it's called a "blastocyst." Implantation bleeding can happen at the time the fertilized egg implants in the uterus - the attachment of the fertilized egg to the uterine lining, on average between 6 to 12 days past ovulation (on average about 9 days after ovulation). Because the lining uterus is made up of blood, there can be a bit of blood expelled in some women.
Read more ...