This is actually fairly coherent and similar to what I believe.
I'd like to add that, on the subject of fetuses/persons/not-persons, we kill all the time, for our own benefit, creatures of much higher mental and emotional capacities than a fetus. So, on the one hand, if you can condone killing a cow you can probably also condone killing a fetus, and on the other, it seems puzzling that pro-life and vegetarianism don't ever align.