Helppp

Okay so i had sex with my boyfriend like 2 days ago and it was raw sex but I had anxiety that he might have cummed in me before pulling out so i took a plan b but it was right before my period was supposed to start and now im having cramps and I feel like i might be getting a uti because my vagina is burning and also my period is late but i know plan b can make your period be delayed but can someone help?