Help! Bleeding a lot!

Okay! So I've just had sex for the third time. I've bled every time so far, but the guy I'm doing it with is very, very large downstairs and I'm assuming it's just that paired with the fact that im extremely inexperienced. The thing is, im bleeding more than usual this third time. Is there a reason? Or should I not be worried because it's probably to do with his girth and the smallness of my vagina?