help I'm a lesbian who had sex with a man for the first time ...

Well he entered me and the angle wasn't right so we switched so he could be behind me. After like a few thrusts I felt a pain and told him we needed to switch that wasn't working. So when I went to get on top I realized i was covered in blood. And not just a little bit there was a lot of blood. Which makes me confused considering I've had penetrative sex with toys so I wouldn't think my hymen would still be there. I had it running down my legs and it was all over him. Is there any other reasons this could have happened. I feel so stupid because I'm 27 and don't understand Hetero sex.