Under what conditions would an abortion be the proper "treatment" and the issue not be a miscarriage or a premature birth? I can't think of a scenario, but I am not in that profession.
1. Later in pregnancy, I can't see where an abortion is the answer versus a premature birth. They have to try to save the baby rather than kill it in the womb.
2. Earlier in pregnancy, I am not sure what health issues can come up that are a threat to the mother's health.