J.S.
Amy,
You poor thing. I had the pubic bone pain with each of my 3 pregnancies. It started earlier with each, and was progressively worse. Chiropractic might help, but my pubic bones would move and pop all by themselves (especially after sleeping, getting up at night was HORRIBLE) so I never tried it, I figured it was a lost cause to keep things in line. Yoga helped some for me. Talk to your doc or midwife, they may have some ideas well.
J.