That's why abortion should be legal. There's no definitive truth to when life begins, it's totally up to interpretation. One person can't legislate their subjective beliefs over another when not everyone believes in the truth they campaign for.
If you want to take the "we don't know which side is right and wrong" approach in this case there is a tremendous disparity in the consequences of each outcome; if it's not a person then outlawing it is forcing a woman to endure nine months of labor, but if it is a person then we're murdering 800,000 people a year.
You forgot the consequence that if they are not aborted those 800,000 people a year become children whose parents (at least initially) don't want them. That's the concerning part, not the nine months of labor.
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