Varies: Not all pregnancies have any bleeding.An implantational bleed can happen when the pregnancy implants in the uterus but this doesn't happen every time and 1/2 of all pregnancies have some bleeding known as a threatened miscarriage in the first trimester. 1/2 of these miscarry and the other1/2 go on to have normal babies and no one knows what caused the bleeding. This varies just like normal periods
Answered 1/16/2015
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