Hi! It could be braxton hicks. I had BH from very early on, about 20 weeks.....I'm surprised that if your OB thought it might be a UTI, why he/she didn't do a urine test? Are you having pain when peeing? UTI's won't hurt baby. I'd get it checked out though because if a UTI is left for a long time, it can end up as a kidney infection, which also doesn't affect baby but isn't fun for you. Good luck hun xx