Question? a few mins ago i bent over to pick something up off the floor. when i did i got this…

Question? a few mins ago i bent over to pick something up off the floor. when i did i got this really really bad sharp pain. made me cry and took my breath away. i am 38 weeks exactly. the pain subsided a little after about 5 mins. but now when i sit or bend i get a crampy pain that shoots to my back and bottom.. any idea what it could of been? was he laying that low it hurt? I've never felt like that before