Rosemary’s Baby, Ira LevinRead about the other entries on the list.
A posh NYC apartment building becomes the spawning ground for a baby demon in this terrifying classic horror novel. Malevolent paternalism plus midcentury Devil worship equals the scariest book about pregnancy ever written (unless you count the ones full of recipes for cooking and eating your own placenta, eeeeeeuuuuwwww).
Also see Chris Priestley's top ten scary short stories.
--Marshal Zeringue