Sex= Bad period cramps??

Hello everyone, forgive me if this sounds like a dumb question but I thought I’d ask because I don’t really know what’s going on.

So recently I’ve been having quite a bit of sex with my boyfriend. (All protected, no worries there 😉). During, it feels SO amazing and he’s the best person I’ve ever been intimate with.

But... his dick is huge. I mean it’s like 8-9 inches full-mast. So we try to keep from going all the way in most of the time, but sometimes we get carried away and it just happens. Which still feels really good but... like I’m afraid it’s hitting my cervix, which doesn’t feel good.

Ever since we started having sex, I’ve had really bad period cramps. I’m not sure if it has any correlation at all, but I’m a little worried. I’m also prone to getting ovarian cysts, which could be a factor of the cramps but I’m not sure. I’ve always had very little to NO period cramps.

Back in my 9th grade sex Ed class, I remember our instructor telling me that the penis hitting the cervix too much can cause cancer 😳😳 I’m not sure if this is accurate at all because it was in South Carolina. Maybe they were trying to scare us into celibacy. They aren’t required to teach us accurate sexual education.

But this still worries me a little bit!! Please comment and tell me what you think.