B.B.
I'm 27 weeks and I'm experiencing the same thing. These things have helped (not completely fixed, but helped): a back massage from my hubby right before laying down; a warm bath; not drinking anything at least an hour before bed (so I'm not in the bathroom as much); lots of pillows to help get comfy. I also try to take short naps, but sometimes that makes it worse. Either I don't nap long enough to feel rested, or too long and then I can't sleep at night. I do think that this is part of preparing us to be up all night. My 2 y/o has slept thru the night since he was about 5 months or so, so I think my body's just getting me ready for this! I hope you get some rest soon!