Agree with Zazzou. You peed...BH contractions can be triggered by a full bladder. I had these terrible contractions last week (32) and they told me that and sent me home. Super embarrassing I know :) but its part of the game.
I think you peed yourself because I can totally relate with you lol! I was dry heaving the other day and the same thing happened to me. I also have a bad cold and sometimes when I cough, I pee a little when it's a coughing fit, gotta get those muscles a bit stronger.........