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I actually don’t believe the “start of life” is decisive or especially relevant. First and foremost I think the constitution and bill of rights give you a right to security of your person which extends to terminating an unwanted pregnancy. The state forcing you to carry to term is a violation of that right. I believe the right of the mother supersedes other rights here because there is only one way to exercise that right, and because self ownership is so core to our constitutional rights.

If you favor originalism, the the 9th amendment guarantees unenumerated rights which were deep rooted at the founding. Abortion before “quickening” was legal in all 13 states at the signing and had been part of common law for hundreds of years, so the 9th applies. The 14th amendment should apply that to the states, and the argument some originalists make about resetting the clock seems dumb to me.

So here are two very reasonable paths to the right that don’t involve the question about when laws start or some vague notion to the right to privacy. I think you need to have both an activist reading of constitutional law and a disregard for security of ones person to sidestep both arguments.