Pain in Vagina when having orgasm

Hey Girls!

So recently I’ve been having this pinching pain in my vagina close to the vaginal hole when having a orgasm. I’m not pregnant and have no STDs but it only hurts when I’m cumming. No pain while doing the do only when I climax rather it be through Masturbating or (excuse my language) but climaxing with my fiancée penis inside me.

Can someone relate? Or do anyone know what it can be? I’ve tried researching but not really finding a lot of information because I’m not pregnant.