Bleeding During Sex

So I lost my virginity a while ago but recently I’ve been bleeding during sex. Sometimes I hurt a little bit during the beginning but my man is great and so is the sex. The blood is starting to freak me out.

I’ve been dating this guy for over a year but lost my virginity in high school to another (with a smaller dick). I don’t think it has to do with size because the blood has only been happening recently

Advice??