Im high risk pregnancy an i had a broken pelvis that healed incorrectly what are the odds it will rebrake if we opt for a natural birth?

Hard to tell: It's really hard to tell because the pelvis has three axes of motion and can rotate and translate on these axes. Malunions of a pelvis can be problematic during pregnancy and without having a ct scan of your true pelvis, it's impossible to determine and you may be putting your child at significant risk. Obviously you can't have a ct or x-ray while pregnant, so it's hard to know without visual info.

Extremely low: You will not break a bone in your pelvis during childbirth. However a poorly healed pelvis may make it harder for the fetus to descend correctly and may cause you pain. Talk to you doctor and review your personal records.