Calendar-based methods are various methods of estimating a woman's likelihood of fertility, based on a record of the length of previous menstrual cycles. Various methods are known as the Knaus–Ogino m
A CycleBeads birth control chain, used for a rough estimate of fertility based on days since menstruation
Birth control
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Birth control, also known as contraception, anticonception, and fertility control, is the use of methods or devices to prevent pregnancy. Birth control has been used since ancient times, but effective
Calendar-based contraceptive methods
…days of the menstrual cycle. These methods may be used to achieve pregnancy by timing unprotected intercourse for days identified as fertile, or to avoid pregnancy by avoiding unprotected intercourse during fertile days. The first formalized calendar-based method was developed in 1930 by John Smulders, a Catholic…
Three varieties of birth control pills in calendar-oriented packaging
A NuvaRing vaginal ring
A rolled-up male condom.
A diaphragm vaginal-cervical barrier, in its case with a quarter U.S. coin.