Great job. Now take it the other extreme: is it okay to kill a baby that had already been born, but was still attached by the umbilical cord? It’s still, technically, part of the mother’s body at that point.
We all just want to go about our lives within being forced by law to sacrifice our rights to our bodies.
My thing with the hypothetical kid needing a kidney wasn't that a parent refusing to donate would be a good person, it was that by principle of law it would be immoral to force them to do it. That was taking the "pro-life" perspective all the way to "it's a whole-ass person" and showing that the concept of bodily autonomy still protects the parent, even if you don't agree with what they do. I don't mind if you think I'm a monster for getting an abortion, I just want to ensure that that choice is there for those who want or need it.
I get that it's a really intense issue for a lot of people, but all I wish is that folks didn't feel like whether someone else carries their pregnancy to term is a criticism of what they've done or want to do. It's truly not. I know for myself I have a list a mile long of reasons I would never carry or raise a child; some are personal and some aren't, but I am still happy when my loved ones welcome a new member into their family.