Lower abdomen hurts when I pee!!

Hillarie • Wife & stay at home mom to my beautiful daughter. We are now expecting number 2! Due date May 18th
I just got blood work done and pap smear everything came back negative. But sometimes when i pee( usually on a fuller bladder) I feel a very strange sensation in my uterus. Its almost painful but then it goes awayy?! Its so strange im 12 weeks just curious if this has happened to anyone else