How to calculate the safe period of early menstruation

I believe many people have heard of this saying: if a man and a woman have sex during the woman's safe period, the woman's chance of pregnancy will be greatly reduced, so many women will calculate their safe period to better engage in sexual intercourse. However, since most women have irregular menstruation, the safe period is difficult to calculate. When a woman's menstruation comes early, how should the safe period be calculated?

1. Misunderstanding of the safe period

The safe period is the so-called seven days before and eight days after menstruation. The seven days before and eight days after menstruation are safe, and it is counted from the first day of menstruation. For example, if your period comes on the 20th, the 20th to 27th is your safe period. But this is just a general rule. In fact, the 7 days before ovulation is not only unsafe, but the most dangerous. Because many people mistakenly believe that the few days after menstruation ends are the safe period and do not take contraceptive measures, the probability of accidental pregnancy is much higher than taking contraceptive measures during the "dangerous period". 8 days after ovulation is relatively safe.

2. The accurate statement of safe period

1. The ovulation period is generally 14 days before the next menstrual period, not 14 days after the start of this one.

2. To be on the safe side, the 5 days before and 4 days after ovulation, together with the ovulation day, a total of 10 days are counted as the ovulation period.

3. The most risky approach is to avoid the normal survival time of sperm and egg cells, which is 72 hours. Therefore, at least 3 days must be left before and after. These 3 days are called the minimum reserved period for the safe period.

3. Special circumstances during the safe period

1. If your menstrual cycle has been 28 days for a long time, you can treat it according to the first seven and the last eight, because this can avoid the 10-day dangerous period.

2. For a woman who often has short cycles, such as a 21-day cycle, the ovulation day is probably on the 7th day. At this time, there is no safe period before ovulation, because the minimum reserved period before ovulation may occur at any time just after the menstruation ends. For such women, there may be a risk of pregnancy even if their menstruation has just ended.

3. For a woman who often has a long cycle, such as a cycle of 35 days, the ovulation day is probably on the 21st day. The delayed ovulation at this time makes it impossible to determine the safe period after ovulation.

4. If the menstrual cycle has always been unstable and the safe period cannot be calculated, the safe period method cannot be used.

The safe period may change due to various reasons, so the safe period can only be used as a reference and cannot be used as an effective means of contraception.