31 weeks pregnant, for three days now my legs have been swollen and now I have a lot of pressure in my pelvis and my lower back hurts so bad. My legs hurt from the swelling and I can barely walk now because of it. Should I go ahead and call the OB?? Or do you guys think this is normal. I haven't had any headaches or nausea. My BP was slightly elevated last Dr appointment. I go for an ultrasound the 25th. I've had some Braxton hicks today too, and peeing like crazy. I'm just worried about my health and LO.