A blueprint only exists on paper. A drawing of a human being is not a human being. A blueprint is nothing more than a drawing of a house. An unborn child at whatever stage of development is not a separate species, it is a developing human being.Maybe.
I look at a baby at birth and I have no trouble accepting that it is a human being deserving of all the protections society bestows. I look at a fertilized egg and I see no heart, brain, etc., I see a blueprint for a human being, not a human being. A blueprint is not a house, you can't live in it, so tearing it up and starting again is just fine. Somewhere between that egg and birth an arbitrary line is crossed that can be discussed and maybe even a consensus arrived at but to claim there is only one answer and you have it is pure arrogance and ignorance.