I have a new horror story idea. What do you think?

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In my newest story, the main character's wife gets pregnant and then mysterious things start happening in the house. At first, they're amusing to the young couple. But then the ghosts start to turn violent. They write bloody messages throughout the house, telling the couple to leave. The couple refuse and the baby is soon born. The ghosts get angry that the family won't leave and threaten to hurt (or take) the baby if the couple doesn't leave. . .