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> I view the fetus as a person, even if they aren’t born yet.

What changed my mind here was the realization that this position comes out of Catholic doctrine that defines "a person" at the moment of conception. Once you made that assumption, it's reasonable to say that abortion ends a person's life (aka murder).

This assumption doesn't match biology, however. In the first trimester, it simply isn't a person yet. It's not a proto-person, and it's not simply a cake that needs to finish baking in the oven. Becoming a person takes active work by the mother's body that isn't completed until well into the pregnancy. You could call that point "viability", but it's not a precise instant in time.

If there's no person yet, then it's the mother's body and it's up to that person what they choose to do with their body, just like in every other instance of bodily autonomy.

It's obviously OK if you believe in the same doctrine, but then it's also not a simple case of ethics anymore.