What you state is a clever distortion of the prolife position on abortion. I have never suggested that the life of the unborn must take precedence over the life of the born. Both have moral value and the life of every human being must be protected.
A physician duty is to save as many lives as he possibly can. If he can save only the life of the mother, he is still doing his duty, Killing is antithetical to the work of a physician.