Print By Mayo Clinic Staff Request an appointment About Sept. 23, 2026 PrintShow references Cason P, et al., eds. Fertility awareness-based methods. In: Contraceptive Technology. 22nd ed. ProQuest Ebook Central. Jones & Bartlett Learning; 2025. Accessed Nov. 12, 2025. FAQs: Fertility awareness-based methods of family planning. American College of Obstetricians and Gynecologists. https://www.acog.org/womens-health/faqs/fertility-awareness-based-methods-of-family-planning. Accessed Nov. 12, 2025. Jennings V. Fertility awareness-based methods of pregnancy prevention. https://www.uptodate.com/contents/search. Accessed Nov. 12, 2025. South-Paul JE, et al., eds. Contraception. In: Current Diagnosis & Treatment: Family Medicine. 5th ed. McGraw Hill; 2020. https://accessmedicine.mhmedical.com. Accessed Nov. 12, 2025. Simmons RG, et al. Fertility awareness-based methods of family planning. Best Practice & Research Clinical Obstetrics and Gynaecology. 2020; doi:10.1016/j.bpobgyn.2019.12.003. Related Products & Services A Book: Mayo Clinic Guide to a Healthy Pregnancy Basal body temperature for natural family planningAbout PRC-20393014 Tests & Procedures Basal body temperature