I THINK IT WAS BRAXTON HICKS????

I’m currently 15w 3days.

Last night at work I had no choice but to wait to go pee due to being busy. Once I went to relieve myself my whole abdominal area from top to bottom tensed up & I felt mensural like cramps. Lasted 15-20 seconds & towards the end hurt really bad. (All the while i was not urinating)

I know it is not a UTI because I know what that particularly feels like. I’m thinking I had my first contraction..??