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 😣
UPDATED- as of today I am not pregnant and also do not have a UTI (yay).. but the doctors did make me do a swab check for yeast infection I get the results tomorrow if it is a yeast infection how did I get it I'm very clean ?!