Okay. Let's say this is not totally impossible in this world setting. A woman is impregnated by a dead thing. Rather an UNdead thing. Zombielike in nature, if you will.
Now, ah...the child would, itself, be undead as well. Which I know really makes no sense, to have a developing child be decompository in nature.
ANYWAY. Like I said, pretend it's possible. It's MAJIK.
The effects of her carrying this child would, I assume, be extremely similar to the effects of a woman who'd miscarried without the fetus purging itself. That is, a septic pregnancy, wherein something is literally ROTTING inside of you.
I'm not horribly familiar with the septic miscarriage. I know it's an infection-like reaction, accompanied by vomiting in most cases, high fever, etc, and can eventually cause death if untreated long enough. I can look up the symptoms in the handy-dandy RN Mother (TM).
I wonder though if this is entirely plausible. My plan is to have her die because of carrying this child. How long do you think it would take? What do you think the long-term signs of her...uh...condition...would be? That is, outward changes to her overall appearance, and general symptoms of the illness. All of this is assuming that she gets no treatment of any sort. Would she die before she realized she were pregnant? Or would it be a...very much slower process?
Any and all comments you may have are welcome. Even if all you've got is just a "Wow that's really WEIRD wtf are you writing," hahaha.