If you’re assuming (a) the truth of Marquis’ theory of what it is that makes killing an innocent human being wrong and (b) that it is no different for a fetus, then, via the overridingness of the wrongness of killing an innocent human being, no other non-life-or-death consideration, such as, say, bodily autonomy, can plausibly trump the wrongness of killing a fetus.

If the above is an accurate reading of what you’re accepting, in your response, then Marquis is the finish line, not the starting point.