This is really interesting - I don't think I've ever seen these particular concepts used together in just this way before. You see a lot of evil-demon-pregnancy stories, and a lot of shippy Miracle Baby stories, but I don't think I've ever seen anyone combine the two. Maybe, possibly, Yahtzee's "I-95" is in the ballpark, and there are probably comparisons to be made with Herself's "Where The Have To Take You In"... but even so, that's pretty rarefied company to keep. Congrats on one of the most original stories I've read in quite awhile.