I am curious if birth control pills prevent you from ovulating, how come you still get periods?

E+P: Birth control pills stop ovulation by interfering with the signals from the brain to the ovary. That occurs because of the estrogen (e) and Progesterone (p) in them. In addition, the e stimulates the lining of your uterus, p stabilizes it; and when you stop the e and p, it causes you to shed your endometrial lining and have a bleed. It is not ovulation, just a w/d bleed by stopping the e+p.