Medically reviewed by Carolyn Kay, M.D. — Written by Amy Mackelden on May 26, 2021

There are a few reasons to not take Plan B, according to Kecia Gaither, MD, MPH, FACOG, a double board certified physician in OB-GYN and maternal fetal medicine and the director of perinatal services at NYC Health + Hospitals/Lincoln.

Gaither recommends not taking Plan B if you:

  • think you’re pregnant
  • have hypersensitivity to ingredients
  • have a history of abnormal bleeding
  • have any condition your health professional says is contraindicated

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