How many women per year actually become pregnant as a consequence of rape? I'm sure it's happened in the past, and will happen in the future, but does it happen 1x/year, 10x/year, 100x/year, or what?
One difficulty I've not seen addressed by those who would seek a "rape" exception to anti-abortion laws is the possibility that such rules might provide women who want to abort their babies an incentive to retroactively decide that consensual sex was really "rape". Although some people would claim women never cry "rape" so they can get out of trouble, events in Durham pretty well prove otherwise.
Biblically, I see nothing to suggest that the life of an adulteress' unborn child was considered worth anything. Putting an adulteress to death would certainly kill her unborn child as well, but I see nothing to suggest that the adulteress was supposed to be kept alive until she gave birth. Although the Bible does not talk about children conceived in rape, I would not see any reason to give them higher stature than those conceived in adultery. Tough issue. I can see no particular basis for denying a rape victim the right to kill the product of such rape, but at the same time I can see no practical way to legislate a rape exception in such a way as to prevent abuse.
Interesting point. I never thought about this.