I've recently lost my virginity and I happened to have bled a lot and it was rather painful, and I was sexually aroused, because he fingered me before hand so it had nothing to do with lack of lubrication, however I didn't think much of it. Four days later we tried to have sex again and he fingered me and no blood came out but before he could even penetrate me fully I started bleeding, a lot, like it was dripping down my leg, now he's my only sexual partner being that I'm seventeen years old and he's only had sex with two other girls. What could this be from ?