This is one of those things that I had to do a lot of thinking on. I mean…. years of thinking.
In the case of health issues, I don't hesitate saying it should be up to the mother what she wants to do. If her body is at stake, or the fetus is harmful, then I don't see where anyone should be able to force specific health decisions upon her. People don't get abortions later in their pregnancy just because they changed their mind and don't want to be pregnant. They do it because something is seriously wrong. There are cases where the fetus' brain has not developed. It literally has no brain, just a brain stem. There is NO chance for survival of it. There are times when the mother has multiple fetuses (such as triplets or more), and it becomes apparent that all are at great risk because the mother can't carry them all. They don't want to abort one of them, and it's a horrible decision they have to make. Again, I don't think it's something I nor anyone else should be involved in. For those reasons, I don't think I'm wise enough, or anybody else is wise enough, to be making the decision for those people by saying it's illegal and they can't do it.
For rape or incest? Again, I think it's up to the mother as to how she wants to proceed. It's a deeply personal decision and I don't think others should be involved. It's a decision she won't make lightly, and I think people should, at most, offer counseling and support, not laws that force her into doing something she can't emotionally handle.
As for using abortion as birth control, I STRONGLY dislike it. I'm not ready to force my view on others by saying it should be illegal, but I do strongly dislike the concept. I do think if it's legal, it should be legal only very early on, and beyond a certain point it should be allowed only for the reasons above. The later the pregnancy goes on, the more I think it should be based on a matter of health than anything else.