Hip problems!!

Did any 3rd trimester mama's have any hip problems. I can barely walk, because of my left hip. It keeps giving out, like I can stand the pain.. Anyone else have this problem??? Or am I just overweight, I've gained over 80lbs during my pregnancy and I am 2 weeks away from my due date. Could that be the reason I am having this problem, or have other moms had this problem too??