Pacifism: a person who believes that war and violence are unjustifiable.
I suppose that implies, then, that the pro-lifers are the pacifists here, though they only really consider violence against the fetus, and not the violence of oppressing the mothers (through use of force when they dare use their bodily autonomy or trust doctors to use gasp science and medicine instead of select excerpts from an old anthology of fables).
The doctors here are really in a bind. They cannot practice medicine without fear of legal repercussions. They are put into trolley problems where flicking the switch has a significant chance of also teleporting them onto the other track, multiple times a day. The only way they can guarantee their own safety (and license, and livelyhood, and that of their family) is through inaction, not pacifism.