Random bleeding?

So I was over at my friends house (we've been having sex for about a month) and I went to the bathroom to brush my teeth. Although mid way through brushing my teeth my feet were getting dropped on badly, so I freaked out and looked down. It was just streaks of blood going down to my feet making a mess on the floor and myself. I've already had my light period this month and I'm supposed to be ovulating right now. What could be going on? This has never happened before!