Well let me ask you this then: If a woman was guaranteed to die if they give birth to a child; however, the child would without a doubt be born, is it right to abort the child? Take into consideration the child would be assured much more time to live then the mother if she didn't abort the baby. Is it more valuable or at least enough valuable at that point to not allow it's abortion?
Here is a common argument I recently heard: If you are okay with aborting a child at any point in time, because the woman was raped or what have you, why would you not be okay with killing the child 2 years later? What's the difference? They are both forms of life.