I cant even walk..

Ok im 38 weeks today and every time im sitting and relaxing i can feel baby is low and its uncomfortable soo i go to stand up and theres soooo much pressure and pain i can't stand straight and can barely manage to take a hunched over, wide legged, step...what in the hell is going on? Ive had this happen before but it would pass after a quick rest or change in position..never this bad. Anyone else? Is this a "call your doctor" moment..this is baby #3 and she's the only one who has done this to me 😳