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Menstrual cycle The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the ...
Diagram illustrating how the uterus lining builds up and breaks down during the menstrual cycle Menstruation (also known as a period, among other colloquial terms) is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. The menstrual cycle is characterized by the rise and fall of hormones. Menstruation is triggered by falling progesterone ...
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 ...
Knowing the first day of a woman’s last menstrual period is useful in other ways. Dr. Arlene Go, an ob-gyn and specialist fellow studying endometriosis at Hera Biotech, tells Yahoo Life that it ...
When Tera Penoyer found out that her 11-year-old daughter had started her menstrual cycle, the Michigan mom immediately knew what to do: Throw a party. “We had red balloons and posters that said ...
The earliest form of counting "artifacts are menstrual calendar bones, notched with correct lunar cycles, tabulating pregnancy and menstruation." [ 10 ] The prehistoric calendar bones include the Ishango bone , the most well known, which was discovered on the shore of a lake in Zaire, Africa, and represented a six-month lunar calendar.
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 ...
There’s nothing more annoying than being caught unawares by Aunt Flo—so when your body and your period tracker aren’t in agreement and bleeding happens sooner than expected, it’s only ...
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