Bleeding from sex !!

Hey! So I have this problem that i’ve been noticing whenever I have sex with my partner. I bleed every single time we have sex and the thing is, the sex does not hurt. TMI…. but at times during sex it can be a little sensitive when he hits my cervix but other than that nothing is painful at all. Side note, with previous partners who were way smaller than my current, i did not bleed during sex. So I assume it’s due to my partners size but is there any way to stop this??? I would really appreciate the help!