You know, whenever I hear this kind of rethoric, two very distinct reactions form inside of me. First, the sci fi lovecraftian nerd inside of me goes "yeah doh", of course this is such, we all saw Alien, which is *the* movie that distinctively "lovecrafted" pregnancy and motherhood into this horrible depiction of parasital formation inside of you, eating you from the inside and trying to break out. Everything is *as terrible* as you mention.
OTOH, my other reaction is of pure disgust. That is the kind of rethoric that a conservative will grab in order to demonize you. That is the kind of rethoric that placed Planned Parenthood at these dire straights it is in right now. Basically you are equating an infant to a xenomorph, eating women from the inside. It's a kind of, and I'll borrow leftist terminology here, a very conscious Otherizing of the unborn so you can in good consciousness toss it to the garbage bin (after extracting useful organs, etc.).
I understand how that kind of talk might be psychologically and politically useful (at least internally inside the Left), but then it does indeed fly in the face of the sheer wonder of witnessing a human birth, where you realise it's not a parasite, it's actually an adorable human being. I cannot see how you can reconcile both "visions", but then that's not my problem. I do warn you that such rethoric is incredibly counter-productive in the wider debate.
e: just for clarification, I posted this before you added half of the content of that post! It does reiterate many things I say here though.