Braxton hicks feels different for everyone. Most of the time they aren't painful, it's you utreus contracting, your whole stomach gets tight and hard. If they get painful, or you have more than 5 in one hour, call your doctor or go to the hospital! I'm only 21 weeks, however, i'm having twins and my uterus is measured at around 33 weeks, i've gooten them since my 18 week. Good luck!