Pregnancy is often a sweet, exciting time. But since these 9 months are full of thoughts about the future and worries about sleep training and diaper changes and how much life will be altered, it's no wonder that this topic has become a favorite one for the horror genre. There are many horror movies that explore the subject of pregnancy, whether a woman is pregnant with a demon, doctors are working on something sinister behind the scenes that she isn't privy to, or she's seeing ghosts in her house.