For years I kind of stuck with the cop-out answer that being a gay guy this was the type of situation I would never be faced with. But life is life & there just has to be better solutions available than terminating a pregnancy in most cases. However, if the pregnancy is high risk the mother should have the option of choice & if it's really high risk I would say she has a moral obligation to have an abortion.
I don't think I could tell somebody who was raped that they had to carry the baby to term either. Although I would think in most of those cases an abortion would be performed very early on. The morning after pill type of thing.