it really just depends on your labor as to when your water breaks. for some people it breaks naturally at home, for some it doesn't break until well into labor, and for some it has to be broken at the hospital.
your doctor probably won't be there for most of your labor. the nurses will come in and out to check your cervix during labor and your doc might pop in to check on you every once in awhile, but for the most part, he'll just be there when it's time to actually deliver the baby and then he'll head off and leave all the newborn assessment and care to the nurses.