This has never happened to me

Okay so last night I was with my really good guy friend. And we talked for the majority of the night. But right before I went home he suddenly said come here and when I did he started kissing me. Well one thing led to another and he was suddenly ontop of me. We've both only sex one other time with someone else so we aren't virgins. But when he went in for one he didn't fit at all. And it hurt but it wasn't to the point I couldn't handle it. Well when we finished he went to the bathroom and I stood up and then I looked down and there was blood everywhere. He walked back out and he grabbed me and hugged me told me it was ok. But this has never happened to me. I've never bled like that before. And he asked me if it was time for my period and I said no I ended last week. We cleaned everything up and I went home. But this morning I'm still bleeding And I'm kinda scared. What should I do?