we start as a lump of quickly dividing cell, a tumor of a kind. We progress though fish-stage, reptile, etc... Different people have different decency standards wrt. killing and torture of living organisms. As we know the society-wide the standard is pretty low - everything, except humans in majority of situation, can be killed and everything, except (thanks God for animal rights people) majority of mammals in majority of situations, tortured. My personal standard as of now is that killing of insects/fish ok, reptiles and birds - don't like it, yet still somewhat ok, and no killing for mammals, and no torture for anybody (at least what i can perceive as a torture). Thus i personally think the abortion is ok up to about week 6-7.