I just turned 29 weeks and I started experiencing severe on and off back pain especially in the nights when I'm sleeping. I would literally wake up out of my sleep screaming and then the pain would disappear and come back again. I'm realizing that when I'm sitting or laying in certain position it tends to affect me most. I have no abdominal pain or bleeding or anything like that. It's just my back. Has any one experience back ache like this? Everyone's telling me it's a part of the process but it's just sooo painful.