I'm trying to understand your point of view not just to refute it. As I understand it you believe life to begin at conception and consider that embryo as having all of the qualities and potential of a child brought into the world.
To explain my view, I believe that pregnancy gives an opportunity to evaluate and through abortion have the option to terminate a pregnancy before it becomes a child. That this act is heartbreakingly difficult I am sure but allows people the chance to have a child when they want, and are able to raise that child with due resources and attention and stable family, as opposed to the potential of being raised in an inescapable hardship and potential resentment. I believe that gives the best chances for the best person, for the happiest outcomes and optimal wellbeing of all involved. And that is why I believe it is morally right to allow mothers the freedom to make that choice if their circumstances dictate it is the best choice. I would prefer the pregnancy never occurred, or that everyone could be in a position to be able to happily and safely raise a child, but sometimes things arent stable or it's just not right, and I cannot possibly make that judgement for others, nor since I cannot impose on others a personal ideology dictating the beginning of life do I think it's fair to impose legal restrictions denying them the ability to make that choice from their own moral grounds for their own personal reasons.