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Every woman has her individual cycle

The menstrual cycle varies individually from woman to woman. The menstrual cycle begins with the first day of bleeding, which is counted as day 1. The cycle ends just before the next menstrual period. An average cycle is assumed to be 28 days. Some women may have shorter (25 days) or longer (36 days) cycles. The computer will use this personal cycle pattern as a basis for its calculations. After some time, if the user has regularly entered her daily temperature and menstruations, the computer will know that this particular woman will ovulate on day X of the cycle and her monthly period will start after X days.

The 3 phases of the menstrual cycle

  • The infertile phase at the beginning of each cycle 
  • The fertile phase around ovulation 
  • And the infertile phase after ovulation to the next menstruation

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Hormones and Temperature

The above graphic illustrates the individual processes of the female monthly cycle and shows how they are reflected in the temperature curve. For this example we use an average 28 day cycle, where ovulation takes place on the 14th day. Please be aware that this is a statistical example, most women have cycles that vary by a few days and ovulation varies from cycle to cycle.

During your monthly menstrual cycle, two hormones race through your system. During the first half of your cycle (menstruation and the follicular phase - from the first day of menstruation until ovulation) estrogen is the star. Estrogen helps your ovaries produce an egg that is released during ovulation. During the second half of your cycle (the luteal phase – from ovulation until menstruation begins), progesterone takes over. After ovulation, the increase in progesterone production causes a slight, but easily detectable increase in you basal body temperature. Progesterone will dominate until it falls in anticipation of your menstrual period.

This is the pattern on which the computer bases its calculations to specifically filter out the six days of a cycle when intercourse could lead to pregnancy. In this time you are free to choose whether you abstain from sex, if you use a barrier method of contraception or if you plan a baby.

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The menstrual cycle

varies individually from woman to woman. An average cycle is assumed to be 28 days. Some women may have shorter (25 days) or longer
(37 days) cycles.

Generally, a woman will eventually have a regular cycle and the computer will use this personal, stable cycle as a basis for its calculations. After some time, if the user has regularly entered her monthly information, the computer will know that this particular woman as you can see in this example:

will always ovulate on the 16th day of the cycle and her monthly period will start after 30 days. This is because ovulation causes a slight, but easily detectable increase in the body temperature. Likewise, the temperature will drop back to normal when menstruation starts (defined as the beginning of a monthly cycle). This is the pattern on which the computer bases its calculations to specifically filter out the six days of a cycle when conception could occur.