Feels like UTI but isn’t!

22.5 weeks pregnant.... past few weeks I’ve been feeling burning after peeing like a UTI that lasts for hours. Went to see OB TWICE and urine was negative for UTI and they said could be my uterus but they don’t know. Now sending me to a Urologist but they can’t see me for a few weeks. I’m on fire! Any mommas have this before!?