can anyone help!!! pelvic pain

I'm 21 weeks pregnant and I have asked my doctor about the constant pain I'm having in my pubic bone. It hurts to walk,stand, sit pretty much all the time expect for the first hour I'm awake. My doctor said it's a little uncommon to be this sore this early. But he has heard of it before. Does ANYONE have any suggestions on what to do to help relieve this pain. And I know it's only going to get worse which scares me because of how bad it is already at 21 weeks.