I have this problem as well. Mine turned into sciatica and the only thing that my dr could tell me to do was to see a chiropractor. I did, and I LOVE IT
!! I walk out of there feeling as if there were never any problems to begin with! I've also done some reading on chiropractics and pregnancy, and going is supposed to help throughout pregnancy and with delivery! One thing I read said that going throughout pregnancy decreases labor by 1/3
!!!!! I'm not planning to stop going, and I'll probably continue after I have the baby. You should look into it and see if this might be something for you!