I have been on BCP for about six months or so. For some reason, a week or two before my last
period, I started freaking out that I might be pregnant. My period usually arrives on Day 4 of the placebo pills, but arrived a day early, stopped, and then started a few hours later. It remained for the normal amount of time. I was on medication, however, and I keep seeing differing statements about its effect on birth control.