How to calculate the ovulation cycle for effective contraception

How to calculate the ovulation cycle for effective contraception for women. For couples planning to have a baby, the application of contraceptive methods is extremely necessary. There are many contraceptive methods for women to choose from, but each method has its advantages and disadvantages. In which, the method of contraception by calculating the ovulation cycle brings safety and is chosen by many women.

Depending on each person's location and some objective factors such as psychology, diet, and activities, each woman's menstrual cycle will be different, usually each cycle lasts from 28 to 35 days. . Based on this cycle, women can naturally avoid pregnancy by calculating safe dates and unsafe dates for conception.

How to calculate the ovulation cycle

The menstrual cycle is calculated from the first day of the previous cycle to the first day of the next cycle. Ovulation is the process when an adult egg (sometimes more than one egg) is released from the ovaries under the stimulation of a hormone produced by a woman's body, falling into the ovaries and then passing away. follow the oviduct toward the uterus.

This is the most fertile time in a woman's menstrual cycle. Ovulation eggs can only live about 24 hours in a woman's body, while sperm can live in a woman's body for 2 to 3 days.

Therefore, if having sex between 1-2 days before ovulation and about 24 hours after ovulation, the egg and sperm will meet, then fertilization will occur. In other words, the fertility time lasts for 5-6 days.

Formula for calculating ovulation cycle:

Calculate the date of ovulation 

During a menstrual cycle, the date of ovulation (R) is calculated by the formula: R = X - 14. Where X is the menstrual cycle. 14 is the number of days that the follicle is formed and immediately after that the egg will be released. The date of the start of pregnancy = date of ovulation - 6. Date of end of pregnancy = date of ovulation + 4.

For example, if a person has a 28-day menstrual cycle then: Date of ovulation = 28 - 14 = 14. Date of starting possible pregnancy = 14 - 6 = 8. Date of termination = 14 + 4 = 18. It follows that the likely pregnancy date of a person with a 28-day menstrual cycle is from days 8 to 18.

Safe days are all days left in the cycle. Where the relatively safe day is from the first day of the menstrual cycle to the seventh day, and from day 18 to day 28 is the absolute safe day. However, it is advisable to limit relations during the period of menstruation to avoid infection.

Note when avoiding pregnancy by calculating the ovulation cycle

Ovulation cycle

The calculation of a safe date for contraception is only relatively effective for women with regular menstrual cycles and stable monthly ovulation time. This calculation does not apply to cases of menstrual disorders, irregular periods or other gynecological diseases.

Even for women with regular and stable menstrual cycles, changes in hormones, lifestyle habits, health, ... may also change this cycle. Then, the safe date will not be calculated or be inaccurate. There is also research showing that eggs can also be released when there is a strong sexual arousal.

Natural contraception according to the method of calculating the safety date of the ovulation cycle has a relative result, about 60% ~ 70%.

It is necessary to monitor the body and the date of ovulation for several months continuously and with obstetric consultation to determine the safe date.

In addition, women can also rely on the following signs to identify or confirm more about their ovulation date:

- Appearance of cervical mucus, somewhat like egg white. This mucus allows sperm to travel through the cervix, up the uterus and then to the fallopian tubes to "crystallize" with the egg.

- Mild pain or discomfort in the lower abdomen. According to statistics, about 1 in 5 women experience pain or discomfort in their lower abdomen when ovulating, which is common during ovulation, which can last from a few minutes to several hours.

Increased body temperature: The hormone progesterone is produced when an egg is released, causing the body temperature to rise. Therefore, a woman's body temperature increases, indicating that ovulation has just occurred. However, it is necessary to have a thermometer and body temperature monitoring table for the days of the month to accurately recognize this.

Hangfah (general)

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