Are any other mommies experiencing possible preterm labor? I am having horrible back aches all day long, a ton of pressure in my lower abdomen, and some period like cramping. I never had this with my first pregnancy. I can't sleep, sit, stand, really do anything without hurting. I am technically 31 weeks tomorrow, but the baby is meauring 2 weeks ahead of schedule and I would be 33 weeks today based on her size. I have big babies! lol