Uti???

So I think I have a UTI. Every time I go to the bathroom after all the pee is all out it doesn't burn but it feels uncomfortable. I also feel flank pain and when I wipe it sort of burns. I haven't gotten a UTI since like elementary school. I'm going to the Dr. First thing in the morning. My mom made a comment saying that what if my bf is cheating and that's how I got the UTI. I mean we hadn't had sex in a month until two days ago, is this a possibility??