Bleeding during sex

I just bled while having sex. It wasn’t a lot or anything but it was that little either. During sex my fuck buddy was going rough which we usually do but this time he accidentally put it inside my ass like 3 times and it hurt just a little( it was like burning a little but not really, idk how to explain). I’ve done anal before but it has never hurt so i’m thinking that’s why i bled this time. It’s not like this was my first time having sex either but i’m just confused as to why i’m still bleeding. I’m 17 if that may help