Excruciating back pain

I'm only 16 weeks and previous to this I've always had lower back pains and now, it's gotten so bad I can't even get out of bed without wanting to cry and without limping and waddling because of my pain. I'm so afraid that its only going to get worse when I get bigger and I'm not even big right now. I feel it mostly on my lower right side almost like a nerve being pinched or something. I'm 5'5 and 160lbs.