[More Cowbell]

If one operates from my premise, your argument does not work. If one operates from your premise, it does work. As we have suggested, the fundamental difference at the root of our "disagreement" bears on the rest of our arguments. If the fertilized egg is equal in "value" to the mother, if the fertilized egg has a relative less value than the mother, upon these hinge our arguments. Would you agree?

My point still can operate under your premise. Even if you say that the fertilized egg has less value than the mother's life, you still admit that there is value. And if there is some value to that life, how does said value not trump the mother's desire to just not be pregnant? You could look at it like on a continuum:

mother's life > unborn baby's life > mother's convenience/preference