The method of calculating the safe relationship to prevent pregnancy is the most natural and easy to understand. Every woman can do it

Normally, for women who have had a 28-day menstrual cycle, the egg may fall out on day 14, starting from the day of menstruation. That is, the period from the 11th to the 17th day of the menstrual cycle will be unsafe. The time from day 1 - the date of menstruation to day 7 is considered to be relatively safe. From the 18th to the 28th day is absolutely safe.

The calculation of a safe date for contraception is only relatively effective for women who have regular menstrual cycle and stable ovulation period for each month. This calculation does not apply to menstrual disorders, irregular periods or other gynecological-related diseases.

Calculate a safe day based on your menstrual cycle

The menstrual cycle usually lasts for 28 days (some people have cycles of 26 days, 30 days, 32 days but not more than 36 days). Based on the menstrual period to calculate the 3 times of the safest relationship, relatively safe and dangerous.

Calculation of the menstrual cycle, avoiding ovulation to have sex will help prevent pregnancy better. The specific calculation is as follows:

Step 1: Monitor the menstrual cycle for at least 6 months. The first day of menstruation is counted as the first day. Watch and record the first day of your period and the first day of your next period.

Step 2: Apply the calculation of ovulation days to avoid relationships:

- Subtract 18 from the shortest date range.

For example: The shortest interval of the menstrual cycle is 28 days, N1 = 28 - 18 = 10 (10th day).

- Subtract 11 days from the longest interval in the cycle.

Example: The longest date range is 31, then N2 = 31 - 11 = 20 (20th day)

Thus, the time of ovulation (the most easily conceived) is in the N1 - N2 days, ie the 10th to the 20th day of the menstrual cycle. During these days, avoid having sex to limit the risk of pregnancy.

Note: For added safety, add 3 days before N1 and 3 days after N2 after the longest date range. For example: The shortest date range is the 10th day, plus 3 days being the 13th day. The longest date range is the 20th day, plus 3 more days as the 23rd day.

According to the calculation method and date range of the above period, the safest date for relationship is from the 23rd to the 6th day of the next period.

The 28-day menstrual cycle was used as a standard formula for calculating other cycles.

The calculation of a safe day by menstrual cycle is not stable

The usual menstrual cycle is 28 days but many women have shorter cycles (26 days) or longer (30 days or 32 days). Therefore, the ovulation time of this cycle is taken as a standard. The time to ovulate the 28 day cycle is the 14th day. Between 11 - 16 days is the easiest time to conceive. The calculation of ovulation days for these cycles is as follows:

- With a 32-day menstrual cycle:

Take the ovulation time of the 28 day cycle as the standard, for every day of the cycle, add 1, the shorter is minus 1. Therefore, the 32-day menstrual cycle is the 15th day of ovulation. The point of easy conception is about 14 + 1 = 15 and 16 + 4 = 20. The day of ovulation is the period 14 + 4 = 18

- With menstrual cycle 26 - 30 days:

With this cycle, it is necessary to take 2 periods, the shortest time and the longest time of the cycle to calculate. Accordingly, if the cycle of 26 days, the fertility time is around the 9th to 14th day. The 30-day cycle, the time of fertility is from the 13th to the 18th day of the cycle.

Combining these two periods, the time of conception on the 9th to the 18th and ovulation day will be around the 12-16.

A natural contraceptive method that uses a safe method of counting a day only reaches a maximum of 60%. For best contraception, you should apply a few other safety measures such as condoms, birth control pills .

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