I thought that 14 days after the first day of your period was ovulation. So why would I start light bleeding like this? My boyfriend and I did have a little bit of rough sex last night but it was only in certain positions and it always does this. I figured it was his penis size that was hurting me. But now I have this light bleeding today. Earlier I had a small little bitty cramp but it felt more like it does when I ovulate. I always have a small pain when I ovulate but never this. What could this be. It kind of worries me. My doctor seems to think that I ovulate 11 days after the first day of my period so could this just be me trying to prepare for my period?