Using the rhythm method to promote fertility doesn't pose any risks.
Likewise, using the rhythm method for birth control doesn't pose any direct risks — but it doesn't offer protection from sexually transmitted infections. In addition, the risk of unintended pregnancy with the rhythm method is higher than with some other methods of birth control. Although effectiveness varies, in the first year of typical use an estimated 13 out of 100 women practicing the rhythm method for birth control will get pregnant.
Nov. 22, 2014
- Hatcher RA, et al. Contraceptive Technology. 20th ed. New York, N.Y.: Ardent Media; 2011:417.
- Frequently asked questions. Contraception FAQ024. Fertility awareness: Rhythm method, basal body temperature method, and more. American College of Obstetricians and Gynecologists. http://www.acog.org/Patients/FAQs/Fertility-Awareness-Rhythm-Method-Basal-Body-Temperature-Method-and-More. Accessed Sept. 7, 2014.
- Jennings V. Fertility awareness-based methods of pregnancy prevention. http://www.uptodate.com/home. Accessed Aug. 19, 2014.
- Smoley BA, et al. Natural family planning. American Family Physician. 2012;86:924.