Physical Danger
Most women in labor throw their punches at husbands, partners, and nurses, so you should be safe down there at home base. Of course, working in a hospital setting does open you up to contagions, and you'll need to practice good hygiene with all the fluids you'll be handling.
Especially in the beginning, being a doctor means not having a lot of free time and thus snarfing down junk food, and a white coat isn't exactly slimming. It means sleepless nights and little chance for exercise, so your general health will suffer unless you take precautions.