Pregnancy curse.

their was a girl name Ashley as she had found a book and had noticed a pentagram on it but not of a Demon star and rituals to bring back dark overlords but a curse that many women had fell under it's curse for the one's that would become pregnant but would remain pregnant even through due date as the curse brings any pregnant lady to their knees as Ashley was one of the many that fell victim to pregnancy as she was a teenager finding creepy stuff but had noticed while having sex with her boyfriend she found out she's pregnant.

(Read the inside of the book to find more)