Changing OBGYNs weeks before due date

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Has anybody done this? I’ve had some really unpleasant experiences with my OB’s, and have been pushing along thinking it will get better... but it’s really not and I’m not feeling confident in the team of doctors.

I’ve paid them a great deal already, and I’m not sure how the rest would work with insurance. Would the new OB just pick up billing from this point forward?