I’ve also heard of many female doctors. One of the hardest thing for doctors is having children and taking care of them during medical school and residency. If you can get tons of help, that would be useful. But once you are a doctor, depending on the type of doctor, you could probably get better hours and much better pay than nurses. I would definitely recommend you speak to other women who have become doctors or PA’s (and there are many), and get any helpful and practical hints of the actual logistics from them.
I do believe that if you really want to do something and it can be used in your serving Hashem, then you should go for it. Good luck!