The Ninth Month by James Patterson

One woman is about to become the victim of her own success.
On the surface Emily Atkinson has it all. A successful job, a luxury apartment in New York City and a glamorous life. But then she lands in the hospital with a double diagnosis.
She parties too much... and she's pregnant.
Her nurse and new friend, Betsey, helps Emily recuperate and rediscover morning runs in the park and quiet nights at home.
But as a series of women go missing, Emily's pregnancy becomes decidedly high-risk...
Will she live to see it through?