"My body, my choice" only makes sense when someone else’s life isn’t at stake.
Fun fact: If my younger sister was in a car accident and desperately needed a blood transfusion to live, and I was the only person on Earth who could donate blood to save her, and even though donating blood is a relatively easy, safe, and quick procedure no one can force me to give blood. Yes, even to save the life of a fully grown person, it would be ILLEGAL to FORCE me to donate blood if I didn’t want to.
See, we have this concept called “bodily autonomy.” It’s this….cultural notion that a person’s control over their own body is above all important and must not be infringed upon.
Like, we can’t even take LIFE SAVING organs from CORPSES unless the person whose corpse it is gave consent before their death. Even corpses get bodily autonomy.
To tell people that they MUST sacrifice their bodily autonomy for 9 months against their will in an incredibly expensive, invasive, difficult process to save what YOU view as another human life (a debatable claim in the early stages of pregnancy when the VAST majority of abortions are performed) is desperately unethical. You can’t even ask people to sacrifice bodily autonomy to give up organs they aren’t using anymore after they have died.
You’re asking people who can become pregnant to accept less bodily autonomy than we grant to dead bodies.