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  • With Mayo Clinic obstetrician and medical editor-in-chief

    Roger W. Harms, M.D.

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Question

Birth control pills: Harmful in early pregnancy?

Is it OK that I was taking birth control pills before I knew I was pregnant?

Answer

from Roger W. Harms, M.D.

Generally, taking birth control pills during early pregnancy isn't cause for great concern. While the practice isn't recommended, it happens fairly often among women who weren't expecting to get pregnant.

Taking birth control pills during pregnancy doesn't increase the risk of birth defects, according to the American College of Obstetricians and Gynecologists. However, a 2009 study suggests an association between the use of birth control pills during the time of conception and an increased risk of low birth weight or preterm delivery. Also, use of certain birth control pills during pregnancy has the potential to induce developmental problems with a female baby's sexual organs.

As a precaution, it's best to stop taking birth control pills as soon as you suspect you're pregnant. If you're concerned about use of birth control pills during pregnancy, ask your health care provider about the risks in your case.

Next question
Fundal height: An accurate indicator of fetal growth?
References
  1. Birth control. The American College of Obstetricians and Gynecologists. http://www.acog.org/publications/patient_education/ab020.cfm. Accessed April 22, 2009.
  2. Chen X, et al. Recent oral contraceptive use and adverse birth outcomes. European Journal of Obstetrics & Gynecology and Reproductive Biology. 2009;144:40.
  3. Ahn AK, et al. Pregnancy outcome after exposure to oral contraceptives during the periconceptional period. 2008;27:307.
  4. Briggs GG. Drugs in Pregnancy and Lactation: A Reference Guide to Fetal and Neonatal Risk. Philadelphia, Pa.: Wolters Kluwer Health/Lippincott Williams & Wilkins; 2008.
  5. Moore KL, et al. The Developing Human: Clinically Oriented Embryology. 8th ed. Philadelphia, Pa.: Saunders Elsevier; 2003:477.
  6. Harms RW (expert opinion). Mayo Clinic, Rochester, Minn. May 17, 2009.

AN01662

Aug. 6, 2009

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