Contraceptive method by calculating the date of the menstrual cycle

Contraceptive methods - There are many ways of contraception such as using drugs, condoms ... but the effective one is simply based on the menstrual cycle to calculate the date.

When you do not want to have a baby, this is also a way to prevent pregnancy, although the probability is not high, but it can still be applied in case of "miss" a condom or oral contraceptive.

A girlfriend's menstrual cycle is considered normal if she has a period of 28 - 32 days and then the date of ovulation (ovulation) falls in the middle of the month, i.e. from day 14-15 of the cycle. .

Based on the date of the ovulation, the menstrual cycle will be divided into 3 different times corresponding to the safety of conception and contraception: time of relative safety, time of danger and time of absolute safety. for.

This method is most accurate for people with regular periods

This method of contraception is only applicable to people whose menstrual cycle is regular and the period is not too long (only about 28-30 days). If your period is irregular and too long, this method will have a very high risk of deviation.

Contraceptive method by calculating the date of the menstrual cycle

Principles

- The ovule (egg after ovulation) can only live 12 hours, otherwise fertilization will die. So from the date of ejaculation back 1 day and to be more sure, going back 2 days will not be able to conceive.
- Sperm can only live for 48 hours: After 3 days of ovulation, it will not be able to conceive.
It is important to determine the date of ovulation:

According to Knaaus and Ogino, in a woman with a 28-day menstrual cycle, the ovule can fall from day 11 to day 16 after the first day of menstruation of the previous cycle; in other words, on the 17th to the 12th day of the next cycle, those 6 days plus 3 days before, and plus 2 days later, including 11 days of fertility, called the unsafe day. .
- So from the first day of menstruation, the unsafe period is calculated from day 8 to day 19 and vice versa is from the 20th to the 10th day before the period again.

In terms of contraceptive significance, the 28-day menstrual cycle is divided into three parts:

Contraceptive method by calculating the date of the menstrual cycle

- Before: from day 1 to day 7: relatively safe
- Middle part: from day 8 to day 19: Unsafe day
- Last part: From day 19 to day 28: Absolutely safe

However, many people still do not fully agree with the judgment of these two authors because they believe that it is possible to release ovules without menstruation, or to have periods without ovulation; or the ovule may fall out at any time; or a cycle where many ovules can shed.

But it must be admitted that 75% of the time the statements by Knaaus and Ogino are correct.

How to apply

With the principle that the second half of the oocyte does not change in time compared to the previous half, so a spreadsheet can be made available in long short cycles.

If your period has a constant number of days, just follow a horizontal line.For example, if your period is regular 30 days, the likely date of ovulation will fall between days 10 and 20.

If in the case of periodic period of the year, you can take the shortest period and longest period to calculate the following:

Example: The shortest period of 26 days minus 20 is 6 The longest cycle is 30 days minus 10 is 20 so the unsafe period will fall between day 6 and 20.

Advantages

Easy to disseminate, easy to apply, without facilities, inexpensive, can be applied for a long time, with no time limit and does not affect health and fertility.

Defect 

- Applies only to people with regular periods or insignificant sausage.
The contraceptive effect is not high because the ovule can fall abnormally.
- Not suitable for couples with high sexual intercourse.
- Cannot be considered as a method of contraception on a large scale.

If you are not sure, use another method of birth control such as the daily pill or a condom.

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