Yeah i have it too, it is common for them to go out of alignment during pregnancy and birth, although OB thinks i may have re-fractured mine as i had previosly broken it as a teenager.
Not alot they can do, I did see a chiro and osteo which helped. But to have it a properly adjusted involes a finger up your bum, which i don't fancy!
The only other thing they can do if it is broken and causing on going pain, is surgery to remove it, which i also dont fancy. So i just dont sit down too long!
It has got better over time, but is still painful.