Sounds like a uti, which I was told is really common during pregnancy. I'd just let the doc know to make sure everything is ok.
Im a ftm too 36w2d I had random bleeding aswell throughout but every pregnancy is different I was told not to worry it was normal but I still went to my doctor. So I would say check in with your doctor.
Happened to me too and it burned when I peed. Turned out blood was in my urine and I had a bladder infection.