I Didn't Know I Was Pregnant is an American documentary television series that aired on Discovery Fit & Health and TLC. The series debuted on May 26, 2009 on Discovery Fit & Health. Each episode features two or more women who were unaware that they were pregnant until they went into labor.

Frequent reasons for the subjects not recognizing pregnancy include:

Mistaking the symptoms for another condition or illness.

Believing they were infertile, and thus not considering pregnancy a possible cause of symptoms.

Not having any of the "traditional" symptoms (weight gain, extended abdomen, feeling of movement in stomach, morning sickness, unusual food cravings).

Assuming their birth control methods were 100% effective.

Vaginal bleeding during pregnancy being misinterpreted as a period.

False negative pregnancy tests.