Burning Urethra

So I'm 13 weeks prego and for the last week I've had this burning sensation that's in the urethral area. It was off and on but today it was all day. It hurts to even walk. So went to urgent care thinking maybe uti...nope. Dr. did vaginal exam...everything normal. She had no idea why I am in so much pain. Shes going to run a culture on the urine, takes a day or two but I'm in a lot of pain. Anyone have any ideas?