Some sources may treat the terms rhythm<unk> and fertility awareness as synonymous. However, fertility awareness is usually used as a broad term that includes tracking basal body temperature and cervical mucus as well as cycle length. The World Health Organization considers the rhythm<unk> to be a specific type of<unk> -based<unk>  and<unk> -based<unk>  to be only one form of fertility awareness. More effective than<unk> -based<unk> , systems of fertility awareness that track basal body temperature, cervical mucus, or both, are known as symptoms-based<unk> . Teachers of symptoms-based<unk>  take care to distance their systems from the poor reputation of the rhythm<unk>  Many consider the rhythm<unk> to have been obsolete for at least 20 years, and some even exclude<unk> -based<unk>  from their definition of fertility awareness. Some sources may treat the terms rhythm<unk> and natural family planning as synonymous. In the early 20th century, the<unk> -based<unk> known as the rhythm<unk> was promoted by members of the Roman Catholic Church as the only morally acceptable form of family planning.<unk>  accepted by this church are referred to as natural family planning (NFP): so at one time, the term "the rhythm<unk>  was synonymous with NFP. Today, NFP is an umbrella term that includes symptoms-based fertility awareness<unk>  and the lactational amenorrhea<unk> as well as<unk> -based<unk>  such as rhythm. This overlap between uses of the terms "the rhythm<unk>  and "natural family planning" may contribute to confusion. The first day of bleeding is considered day one of the menstrual cycle.
Calendar-based contraceptive methods
Combined injectable birth control
Long-acting reversible contraception
Heat-based contraception
Safe sex
Combined oral contraceptive pill
Contraceptive mandate
Extended cycle combined hormonal contraceptive