This question is a tough one for me to answer...
I do consider an unborn fetus to be a living person, and I do believe that abortions is murder. I think that if a couple had consensual sexual intercourse that led to a normal pregnancy, regardless if the pregnancy was unplanned or if they weren't ready to have children, I don't think they should abort. If they didn't wanted to have kids, they should've been prepared in the first place. If they were irresponsible when they were having sex, then they should deal with the responsibility of having a kid. And I think it's selfish for that fact.
However, I do believe that a mother's life is more important than the fetus. If a pregnancy, for example an ectopic pregnancy, threatens the life of the mother, then I believe that abortion should be justified for the mother's well being. I also feel that is an infant is to be born with defect that are so severe it would cause more suffering if it was born then I think abortion should be justified.
I have mixed opinions with aborting pregnancies that resulted from unconsensual sex (rape), incest or between an adult and a child. One side of me says that the mother has the right to abort the baby because she didn't consent to the pregnancy and that the baby might end up being a reminder of that rape, but then I think that it's not the child's fault and that if the pregnancy isn't endangering the mother's life she should've kept it. I think in this situation, adoption is best.
And even though I am against abortion in most situations, I do believe that abortion should remain legal, not because I support babies being unnecessarily killed off, but because at least from the mother's part it is much safer. If it was illegal, there would still be abortions but would often involve methods that can cause complications on the mother's part.