UTI?? HELP!!

Hi, so about a week ago I let my boyfriend cum inside me (I’m on the combo pill for birth control so ya’ll don’t freak out too much) and ever since then my vagina has been incredibly irritated, my pee hole (sorry for sounding childish I don’t have the right anatomical name 😅) burns and when I pee it burns a little. The only relief I feel is when I sit on the toilet and I’m peeing often, like super frequently. I’m incredibly uncomfortable and I don’t know if I have a uti? Yesterday my boyfriend came in me again and it’s been irritated all day again, showering today didn’t help. I don’t know if that’s what caused it, I peed after too. But I don’t know, I’ve never had one of these so please help! Any tips would be great. I’ve scheduled a doctors appt for the 21st but I’m just so uncomfortable :(