Ladies help!!

So, about a month ago I got a UTI, went to the doctor and was proscribed an antibiotic. After I took the antibiotics I started to notice an odd smell to my discharge but no other side effects, I gave it a week to see if it was a side effect of the antibiotics. After it didn’t go away I decided to try Monistat thinking maybe it was a yeast infection of some sort. After I finished the medication everything was awesome! And then bam, today I woke up with what feels like ANOTHER UTI. I’m dreading going to the doctor and being given more meds and causing a foul smell again or worse, finding out it’s an STD. Could it be possible it’s not a UTI at all? I’m really worried this means hubby was unfaithful 😭