I'm not a lawyer, I do not think they would make a ruling that made women responsible for "a crime against a person" while she was pregnant, that simultaneously made abortion illegal. As I have said before, I don't think the law is the best thing for this, but I also don't see why it's immediately anti-feminist to think that women should have their rights somewhat restricted while they are pregnant at least morally.
As far as personhood goes. In my eyes a foetus is a future (potential) person. I have no problem with someone stopping this future person becoming an actual person (abortion). If someone did something to damage that future person, knowing that would mean, in 5 or 10 years there would be a harmed person, yes I do have a bit of a problem with that. I don't see there's a contradiction in my views there. The person being harmed is not the foetus, it's the 5 year old, with a time delay. I don't know how the law deals with that, like I said it doesn't mean that abortion is wrong, or is a crime against a person.
You mentioned mountain climbing, I think that's interesting. It's all on a spectrum probably. Because if an unborn baby was harmed mountain climbing, chances are the pregnant woman is, so that's her decision. And it's probably a lot safer for the baby than drinking to excess. But drinking to excess the baby could potentially be much more harmed that the mother, and the liklihood is higher. I don't want people going around telling pregnant women what to do all the time but your idea that pregnant women have a right to harm their child, otherwise it's unfeminist, no.
eta, that's just my opinion, but also I think I'm a feminist nevertheless.