[MHGinTN]

Even in the morula age, as the newly conceived human life is moving along th fallopian tube toward the uterus, the embryo/morula is poerforming purposeful actions as an organism, for it is preparing itself to hatch from the zona pellucida and implant in the uterine lining, and this process cannot be accomplished until the new life has differentiated certain cells to accomplish the release of enzymes necessary for the preparation of the uterine tissue! That there may actually be two humans in that early cell structure, with one about to emerge but not yet seen doesn't mean the life is less human, less at least one human being.

[Coleus]

And from what I understand, right after conception, it's the father's DNA, the father, who protects that new human life from the mother's immune system and is responsible for building the chorion, amnion and the other layers that make up the placenta.