Bleeding after fingering

Okay, um this might be a little tmi but...

Everytime my bf fingers me, he has blood on his fingers after and there's a little blood on a toilet paper after I wipe for like a day and then it's okay.

He is rough sometimes but it's not painful or anything and I enjoy it but yeah.... It didn't really worry us after the first few times but it still keeps happening so.... Is that normal?

(Also I'm a virgin, so I personally think it has something to do with it but who knows.)