So this is kind of worrying me, my girlfriend and I are 17 and 16 year old virgins, we have been talking about sex for awhile and it just hasn't happened yet, but yesterday we were in her room making out and it was getting very heated. She had her period about a week before, maybe a little longer and she started to bleed before we even had sex. I didn't finger her that day and I didn't have sex with her. I'm kinda freaking out and so is she. Could her cherry have popped without anything in her to do it?