Pain during sex!

I have been getting these really sharp pains during sex! I mean near tear pain!!

I know its not any STDs or anything, we've both been checked this month as routine and such. But it came out of no where!! Its only at a certain angle, but I know its not the depth or his size. We have been having sex for 7 months.

It hurts insanely. I go to the doctors tomorrow to find out, but want to know of you guys have any insights.