Published on: April 11, 2002

Jennifer Lopez is in the middle of a pregnancy crisis and is hiding a dangerous medical secret from the world, The ENQUIRER has learned exclusively.

The 31-year-old superstar has been vomiting from what she calls "morning sickness," is taking fertility drugs and recently had medical tests to monitor a condition that di-rectly impairs her ability to get pregnant.

The issue that goes on sale Friday chronicles J.Lo's visit to a top fertility specialist, her "morning sickness" drama on the set of her new movie ... and more.