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  2. Creighton Model FertilityCare System - Wikipedia

    en.wikipedia.org/wiki/Creighton_Model_Fertility...

    The Creighton Model FertilityCare System (Creighton Model, FertilityCare, CrMS) is a form of natural family planning which involves identifying the fertile period during a woman's menstrual cycle. The Creighton Model was developed by Thomas Hilgers, the founder and director of the Pope Paul VI Institute.

  3. CycleBeads - Wikipedia

    en.wikipedia.org/wiki/CycleBeads

    The Standard Days Method identifies days 8-19 of cycle for women with cycles between 26 and 32 days long, as the potential fertile window. This formula is based on computer analysis of 7,500 menstrual cycles and takes into account cycle length, the timing of ovulation, the variation of the timing of ovulation from one cycle to the next, as well ...

  4. Calendar-based contraceptive methods - Wikipedia

    en.wikipedia.org/wiki/Calendar-based...

    The standard days method is also considered a calendar-based method, because when using it, a woman tracks the days of her menstrual cycle without observing her physical fertility signs. The standard days method is based on a fixed formula taking into consideration the timing of ovulation, the functional life of the sperm and the ovum, and the ...

  5. Natural family planning - Wikipedia

    en.wikipedia.org/wiki/Natural_family_planning

    Symptoms-based methods rely on biological signs of fertility, while calendar-based methods estimate the likelihood of fertility based on the length of past menstrual cycles. Clinical studies by the Guttmacher Institute found that periodic abstinence resulted in a 25.3 percent failure under typical conditions, though it did not differentiate ...

  6. Fertility awareness - Wikipedia

    en.wikipedia.org/wiki/Fertility_awareness

    Calendar rules may set a standard number of days, specifying that (depending on a woman's past cycle lengths) the first three to six days of each menstrual cycle are considered infertile. [31] Or, a calendar rule may require calculation, for example holding that the length of the pre-ovulatory infertile phase is equal to the length of a woman's ...

  7. Menstrual suppression - Wikipedia

    en.wikipedia.org/wiki/Menstrual_suppression

    When the first birth control pill was being developed, the researchers were aware that they could use the contraceptive to space menstrual periods up to 90 days apart, but they settled on a 28-day cycle that would mimic a natural menstrual cycle and produce monthly periods. The intention behind this decision was the hope of the inventor, John ...

  8. Birth control - Wikipedia

    en.wikipedia.org/wiki/Birth_control

    A CycleBeads tool, used for estimating fertility based on days since last menstruation. Fertility awareness methods involve determining the most fertile days of the menstrual cycle and avoiding unprotected intercourse. [92] Techniques for determining fertility include monitoring basal body temperature, cervical secretions, or the day of the ...

  9. Extended cycle combined hormonal contraceptive - Wikipedia

    en.wikipedia.org/wiki/Extended_cycle_combined...

    It works by reducing the frequency of the pill-free or placebo days. Extended cycle use of COCPs may also be called menstrual suppression, [2] although other hormonal medications or medication delivery systems (hormonal intrauterine devices—IUDs) may also be used to suppress menses. Any brand of combined oral contraceptive pills can be used ...

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