I think the valid case that women are in charge of their own bodies is the best case to make for abortion. I don't think it's a valid argument to suppose the fetus doesn't feel pain, or hypothesize about what point it develops into a human. If the feelings, pain levels, etc. of the fetus are considered, there is a case to be made against abortion. Therefore, the pro-choice arguments should be made based solely on the health, condition, decision, etc. of the mother.