Sounds like Pubic Symphasis Disfuntion to me. No biggie, and you'll feel so much better after you deliver. It hurts like hell, but will heal after you have the baby. I had it, and had to go on disability at about 34 weeks. Couldn't roll over or lift one leg off the other without extreme pain. Use a body pillow to sleep better! Here is some more info: http://www.plus-size-pregnancy.org/pubicpain.htm
Hope you find some relief!