Help...

I had sex with this guy yesterday and I haven't had sex since March and it was hurting me, after a while the pain went away and it was more pleasurable. But now I'm feeling pain on my vagina and I feel like something isn't right, I want to go to a gynecologist so I can check if I'm all set, This has never happened to me what do I do? (SB: there's no weird discharge, i just keep feeling the penetration and I don't like this feeling I can't sit still!)