The first "first seven and then eight", the first seven refers to the first seven days of menstruation, and the last eight refers to the first day of menstruation, including the eight days of menstruation. Only when menstruation is accurate can the safety period be determined. Usually the menstrual cycle is about 30 days, and the last eight days are more reliable. If the menstrual cycle is short, it will be about 26 days. Then the last eight digits should also be shortened. Because on the eighth day, it was close to ovulation.

The second factor that affects ovulation. Women are emotional creatures and are easily influenced by emotions, so ovulation will be irregular. Women with normal menstruation generally count the fourteenth day as ovulation day on the first day of menstruation, avoiding the three days before and after this day, and theoretically will not be pregnant. But women's mood swings, stress and drugs will all affect ovulation, so the date of ovulation is not so accurate.

The third safe period is relative to the ovulation period. As long as the ovulation period above is avoided, the safe period is relatively "safe", which is a relative problem. Of course, the most reliable method is B-ultrasound monitoring and ovulation test paper to find out the ovulation date, and then cleverly avoid it.

If you want to get pregnant, I personally think that you should have an examination every month to see if the eggs are normal. If you are using contraception, you can trust the safe period when your menstrual cycle is normal. If your menstrual cycle is abnormal, it is not recommended that you use the safety period. It is better for men to take measures. Love others before you love yourself. I hope my humble opinion will be useful to you.

There is a saying that "nothing is absolute". Is "the first seven and the last eight" really an absolute safety period? This is only relative. Relatively speaking, it means that the pregnancy probability in "the first 7 months and the last 8 months" is lower than that in other periods, but it is not absolutely risk-free and absolutely safe. This method is not recommended as a safe contraceptive method.

The first 7 refers to 7 days from the first day after ovulation to the day before the next menstruation, and the last 8 refers to 8 days from the first day of menstruation to the day before ovulation. However, with the increasing pace of work and life in modern society, women's physiological cycle and ovulation period are disordered due to work pressure, personal emotions, physical health and other factors. The first seven items and the last eight items are completely out of order, so it is very risky to refer to contraception on this basis.

Now some young people just want to be happy for a while, but they adopt the method of "first seven and then eight", which is not recommended. It is suggested to consider choosing condoms, which is also a sign of being responsible for yourself and your partner. If you love, please love deeply! If you don't love, please don't hurt!

The above is my personal opinion, do you think it's right? Welcome to discuss, thank you for meeting!

This is not an absolute safety period.

The period from the day when menstruation begins to the day before ovulation begins is the safe period before ovulation, which is usually 8 days, that is, the last 8 days. The safe period after ovulation is from the first day after ovulation to the day before the next menstrual cramp. Usually seven days, that is, the first seven. We call the first five days and the last four days of ovulation day, including ovulation day, ovulation period. After the egg is discharged from the ovary, it can live in the fallopian tube for 1-2 days and wait for fertilization. Male sperm can be fertilized in female reproductive tract for 2-3 days, so it is easy to get pregnant by having sex a few days before and after ovulation. To be on the safe side, we add the first five days and the last four days of ovulation, plus the survival time of male sperm, which is what we call the first seven days and the last eight days of ovulation. If the menstrual cycle is 28 days for a long time, then the algorithm based on the first seven and the last eight is relatively accurate, but it does not mean that all women's physiological cycles are the same. For example, if the cycle is 2 1 day, then the ovulation day is probably the seventh day. At this time, there is no safe period before ovulation, because the minimum reserve period before ovulation may be encountered at any time. For such a woman, even if she has just finished her menstruation, she may be in danger of getting pregnant. The cycle is 35 days, so the ovulation day is about the second day1day. Ovulation that is often delayed at this time will make the safe period after ovulation uncertain.

1. The top seven and the bottom eight are uncertain, because everyone's situation is different.

2. Many people miscalculate the last eight, thinking that they will start counting after the official holiday.

The last eight are counted from the first day of the holiday.

It is recommended to take safety measures.

For a long time, women have used some expressions to prevent pregnancy, such as the first seven and the last eight. In other words, it is safe seven days before menstruation and eight days after menstruation. During this period, the chance of pregnancy is very small. So, are the first 7 and the last 8 safe periods? Let's take a look.

The period from the day when menstruation begins to the day before ovulation begins is the safe period before ovulation, which is usually 8 days, that is, the last 8 days. The safe period after ovulation is from the first day after ovulation to the day before the next menstrual cramp. Usually seven days, that is, the first seven. We call the first five days and the last four days of ovulation day, including ovulation day, ovulation period. After the egg is discharged from the ovary, it can live in the fallopian tube for 1-2 days and wait for fertilization. Male sperm can be fertilized in female reproductive tract for 2-3 days, so it is easy to get pregnant by having sex a few days before and after ovulation. To be on the safe side, we add the first five days and the last four days of ovulation, plus the survival time of male sperm, which is what we call the first seven days and the last eight days of ovulation.

If the menstrual cycle is 28 days for a long time, then the algorithm based on the first seven and the last eight is relatively accurate, but it does not mean that all women's physiological cycles are the same. For example, if the cycle is 2 1 day, then the ovulation day is probably the seventh day. At this time, there is no safe period before ovulation, because the minimum reserve period before ovulation may be encountered at any time. For such a woman, even if she has just finished her menstruation, she may be in danger of getting pregnant. The cycle is 35 days, so the ovulation day is about the second day1day. Ovulation that is often delayed at this time will make the safe period after ovulation uncertain.

The above is about whether the first seven and the last eight are safe periods. In short, the algorithm of the first seven and the last eight periods of women's safety period is aimed at women with regular menstruation, and many women's safety periods are also affected by temperature, environment, mood and disease. Therefore, the algorithm of the first seven and the last eight women's safety periods is not necessarily accurate. I hope this article can help everyone.

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Condoms and short-acting contraceptives are safer. Nothing else is reliable.

If you look for the word "absolute", I believe many things will be unexpected.

"The first seven and the last eight" is a commonly used method to calculate the safe period in safe period contraception, but some women fail to use contraception because of their misunderstanding of "the first seven and the last eight".

Let's briefly introduce the "first seven and then eight":

Top seven:

That is, seven days before menstruation, which is after a relatively safe safety period.

The last eight:

It refers to eight days after the first day of menstruation, not after the end of menstruation. If a woman starts menstruating on June 6th, 65438+February 10th, 065438, and ends on February 6th, 65438, then the "last eight" refers to eight days from June 6th, 65438+February 10th-08th, rather than17-6558. In fact, the days when a woman excludes her menstrual period are actually only 65438+ February, July and August.

Women's safety period is divided into pre-ovulation safety period and post-ovulation safety period. The period from the day when menstruation is clean to the day before ovulation is the safe period before ovulation. The safe period after ovulation is from the first day after ovulation to the day before the next menstrual cramp. The safe period after ovulation is safer than that before ovulation, because some women sometimes ovulate early due to environmental changes and emotional fluctuations, so the safe period before ovulation will be shortened. It is rare for the ovary to ovulate twice in a menstrual cycle, that is, the second ovulation will not occur from ovulation to the next menstruation, so the safe period after ovulation is safer.

Although the probability of pregnancy in the same room during the safe period is low, it is not absolutely safe. Safety period refers to avoiding the life of husband and wife who are prone to pregnancy before and after ovulation without any contraceptive methods or operations, so as to achieve the purpose of contraception. But in fact, this method is not safe, because women's ovulation time is affected by external environment, climate, personal mood, health status and other factors, which makes ovulation delayed or advanced, and there may be extra ovulation. In addition, the longest survival time of sperm and eggs in female reproductive tract is still inconclusive, so the safety period cannot be accurately calculated. Therefore, it is not safe to share a room during the safety period.

You can try it and verify it once.