Pain during sex - Can some one familiar with the woman's body help me?

Sometimes this happens to me, it might be that your partner penetrated you too deep.. and hit your cervix. Sometimes it can feel good but other times it's really uncomfortable. Ask him to try not to go in all the way, or try different positions where he can't penetrate that deep. Sorry if this sounds inappropriate ahaha but this is all I could think of. If that doesn't work, maybe ask your doctor or go to a gynecologist. Hope this helped, and good luck!!! :)