The reason religion is so powerful

[The Architect Of Fate]

Okay, and do you understand why the placenta needs to hide from the mother's immune system? Because, contrary to many pro-choice arguments (and I understand not everyone goes this far), this is not the woman's body. The embryo is a separate organism, with a separate genome, and a separate blood supply.

It's inside the women's body period. Its possession of a distinct genome and a blood supply is irrelevant.

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Parasitism is a symbiotic relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life."

Parasitism is one life form feeding off another same species or not, And no it doesn't require the parasite to harm the host and it could be argued the embryo causes harm. Lastly, the embryo is adapted to feed off the mother. 

So again nice try