Help!

Last Friday I stupidly had unprotected sex with this guy I’ve been seeing on and off for a couple months. I had come off the pill Thursday for my week off and he had no condoms so we relied on pull out, stupid now that I think about it. As worried as I am about being pregnant I did get my period so I know I’m fine in that field BUT for the past five days it has been so painful to pee. I’m not sure whether it’s just a vaginal tear or an STD, someone please give some advice on what I should do!