Has anyone else experienced this?

JessiKirschen
First off in December I had a TERIBLE UTI. Like horrible dreaded having to pee  every 3 minutes. I took so much Azo or what ever I was staining the toilets at school. Embarrassing. I took 3 different anti biotics. 
Well after that all was well till a couple days ago I had a bad burning sensation like BAD . Felt like I wiped with icy hot. 
Doctor said I had a uti and yeast infection..... Yea.... then yesterday I also go AF? It's crazy light and pink and only when I wipe do I see it. I had no normal sighs it was comming. Can antibiotics do that?