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The Natural Method of Contraception

Many women try to avoid the use of chemical or hormonal contraceptives. There are plenty of reasons for that: their secondary effects, a possible negative influence on health in present or future, some particular reactions of the body and many more. There are also religious beliefs that definitely forbid the use of contraceptives.

The natural method of contraception is the safest method for health and it is suitable for the large majority of women. It has a high efficiency level (up to 95%). For a normal period of 28 days, this method allows 18 – 20 days of free sexual life.

The only method that is 100% efficient in the prevention of pregnancy is total abstinence. At the same time, there is no method 100% efficient for obtaining the pregnancy. The efficiency of all the family planning methods highly depends on the actions of the involved persons.

During the “unsafe” period, you should avoid the sexual contact or use other methods of contraception, such as condoms or the interruption method (coitus interruptus).

The calculation of the “safe” and “unsafe” days is possible by using the information regarding the last menstrual periods. CALMENS performs complex calculations in order to display not only the “safe” days, but also the probability to get pregnant for each past day or a few months forward.

The women who have a regular menstrual period may rely on this method. However the women with an irregular menstrual period (whose length varies more than 2 days from one month to another) have to use additional and more accurate methods for the determination of the date of ovulation (the sympto-thermal method, for example).


Using the natural method of contraception (and therefore the CALMENS application) is not recommended for a woman if one of the next situations occurs:

– the menstrual periods are very irregular
– the length of the menstrual period is shorter than 21 days or longer than 39 days
– the woman works in shifts (day / night) or she changes the time zone
The Menstrual Period

It represents the interval between the first day of a menstruation period and the first day of the next menstruation period, including the days with bleeding.
The medium length of the menstrual period is 28 days, but it can be much longer or shorter than that. The normal length of the menstrual period is between 21 and 39 days. The ovulation occurs about 14 days before the next menstruation.
The lack of the menstruation is usually the sign of pregnancy.

The menstruation represents the detachment of the tissue that lines the uterus, which regularly appears at the women between [menarche] (the beginning of the menstrual period) and the menopause (the end of the menstrual period). It causes a vaginal bleeding which lasts 3 to 7 days and appears every 21 – 39 days (the length of the period).

Although many people consider the menstruation as the beginning of a new cycle (CALMENS does it too), it is in fact the end of the previous cycle. Being so easy to identify, it has symbolically become the beginning of a new period.

The endometrium is a tissue that lines the uterus. It is formed before the ovulation and awaits a fecundated ovule to implant. If the ovule is not fecundated, it won’t be implanted; about 2 weeks later, the tissue that has been formed in the uterus detaches. The body will produce it again for the next ovulation.

Contrary to a wide spread belief, when a woman is in her menstruation period, she does not have a bleeding, although it looks this way. There is no loss of blood, excepting the one that has already been formed into the endometrium.

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