So, I've never had a great answer to this question:
My neighbour has severe kidney failure, and will die without a kidney. I'm a donor match, and have two healthy kidneys . . . and there are no other donors around. I don't really like my neighbour though, so won't give him my kidney. This means that he will die. Forcing me to undergo surgery and forever alter my life is totally unacceptable of course, because I have autonomy over my own body.
A woman is pregnant, and the fetus will die without her to grow in. This woman isn't able to financially support another child, had a really hard time during the birth of her last child (nearly dying), and so wants to have an abortion. This means that the fetus will die. Preventing the woman from undergoing surgery and forcing her to forever alter her life is totally acceptable of course, because she doesn't have autonomy over her body.
How is this logically consistent in any way?