Clicking/popping noise?

33 weeks and 5 days but have been hearing this for a week now. Anyone else hear a clicking or popping noise coming from your belly? I usually hear it when he starts to move around. MIL says it's probably me popping but I swear it's not me I think it might be the baby?!?!? Anyone else experiencing this and have you asked your dr. Or midwife? I have an appointment next Wednesday so I will ask then. But anyone else experiencing this?