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Although if confronted with the two options (abortion, bag fetus), I'm sure pro-lifers would always choose the latter.

You would hope pro-choice people would as well.

How far do we take it though. If they manage to move the tech back to close to conception

Is there an obligation to bag and try to save every single fertilized egg?

That is true. I guess one constraint would be the effectiveness of pregnancy testing i.e. how early can it detect conception?