I do see your point, and I understand the impetus for debate. But let's just say, for argument's sake, that a fetus is indeed not a human. Surely we can agree that it WILL be a human, unless something unexpected happens. So that begs this question...is it any less evil to kill a prospective human with prospective consciousess than it is to kill a human? I say no.
If I snatch an egg from a robin's nest and crush it in my hand, am I not, in effect, killing a bird?