Painful to walk unless on my birthing ball?

Cynthia 👨‍👩‍👧‍👧 • Mommy of 3. 💕💙
What could this mean? I woke up with a hard stomach and it wouldn't go away. I drank water, walked around well it got worse and it only helps if I sit on my ball. I have an appt in a few hours but I still have to go to work. What could this be? Any experiences anyone? I am 36 weeks. I know it ain't Braxton.