Calendar-based methods are various methods to determine the fertility period of a woman to have positive pregnancy result, by timing unprotected intercourse for days identified as fertile or to some, to avoid pregnancy by restricting unprotected intercourse for days identified as infertile.
The first red bleeding is considered day one of a menstrual cycle. Most menstrual cycle has several days of infertility, fertility periods and then other days of infertility for the next menstrual cycle. Before selecting the best type and most effective calendar method to achieve positive pregnancy result, you have to determine the length of your menstrual cycle. Various systems are known as the:
Rhythm method
1. Determine the length of menstrual cycle
2. Estimated length of pre- infertility period: Subtract nineteen (19) from the length of woman’s shortest cycle
3. Estimated length of start of the post- infertility period: Subtract ten (10) from the length of woman’s longest cycle.
Illustration:
Woman’s menstrual cycle is range from 30-36 days.
Estimated length of pre-infertility period is ((30-19) = 11).
Estimated length of start of post-infertility period is ((36-10) =26)
Therefore: A woman is infertile for the first 11 days of her cycle. Fertility period on days 12-25 and then the start of post infertility period is on the 26th day.
Standard Days Method
The Standard Days method is simpler and more effective than rhythm method. The Standard Days Method may only be used by women whose cycles are always between 26 and 32 days in length. In this system, days 1-7 of a woman's menstrual cycle are considered infertile. Days 8-19 are considered fertile.
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