Please help very nervous

I had unprotected inter course Saturday and Sunday both times my partner pulled out perfectly he knows his body very well.. Anyways last night I started to feel kind of a burning/itch down there and then today it was burning to pee!? Is this a uti? Or yeast infection? I'm only 16 and I read that pregnancy causes it I'm very scared because my family is not the greatest when it comes to topics like that.. AF is due in 4 days should I be worrying about pregnancy or is it just a uti? Please help I have no one 😣