Lately when I have sex with my boyfriend my vagina fills weird! Like there is a lot of pressure pushed in to my belly button from my vagina. Even after it hurt my tummy could hurt for hours before it stops. I also feel supper tired when I get these pains in my tummy they come and go all the time. & there is never any blood!! What can cause all this pain?

We haven't examined you so we don't know. You need to see a Physician. It could be a problem. It could be nothing. You need to find out.

Is it possible that he's hitting your cervix during sex?