I agree that we need your deductible as well. And remember that you and your baby count as two people, so you pay two deductibles.
Since you had a previous c-section, I am guessing that you will have another, unless you plan a VBAC. Costs can vary dramatically, but I think around 20k is around the average (you can usually look up average costs by hospital).
So assuming 20k, then your 30% is 6k. Plus you have to add the two deductibles.
I would also look at what your out of pocket max is. That will give you an idea of the worst case scenario.