I recently had sex the day before I was supposed to get my period. I did not get my period the next day. I am on birth control. However, my reminder to take my pill that day did not go off. I've been on birth control for about two years and I take it on time pretty much every day except for maybe a few mishaps here and there. We did not use a condom, but instead the pull out method. I'm also back at college and this would be my first period being back. I didn't know if the stress of being back at school or the fact that I missed my pill that day could throw off my cycle at all. Please help!