causes of first trimester bleeding
About 20% of women have some bleeding during the first 12 weeks of pregnancy. Possible causes of first trimester bleeding include: Implantation bleeding. You may experience some normal spotting within the first six to 12 days after you conceive as the fertilized egg implants itself in the lining of the uterus.
Possible causes of bleeding in the first trimester unrelated to miscarriage: Cervicitis is a condition in which the delicate cells at the mouth of the womb (or the cervix) bleed due to the mechanical action of intercourse, the alteration of acidity in the vagina (pH), or the effects of infections on these cells.