Its an intensely personal issue, but unique in the religious or cultural influences that tend to generate responses. The notion that any religious implications have an authority outside of the realm of their own given authority as divine, i.e. the self appointed Christian police of the globe is tragic, I think, but true. The Christian has only the authority within the congregation, meaning the legislature that is often influenced by them regarding issues like stem cell research, abortion, birth control or homosexuality are not very Christian. The ancient Jews didn't persecute those outside of the nation of Israel.
Whether it is "wrong" or "right," "murder" or "convenience" is subjective, but seen from a practical perspective the potential of a living being growing is torn or burned to death. I think it becomes a question of what is best for the mother and to a lesser extent, the child.