That friend told me what the first seven and last eight mean, make it clear, OK, thank you

The first seven days and the last eight days are the safest for girls to menstruate, and the pregnancy rate is very small.

The first seven and last eight are the safest for girls to menstruate seven days before and eight days after menstruation.

When things don't go well, you can't do it, and you fail again and again, and you get discouraged.

The period from the first day after menstruation to the day before the start of ovulation is generally 8 days, which is the last 8. From the first day after the end of ovulation to the day before the next menstrual period, it is generally 7 days, which is the first 7. This period of time is called the safe period, which is relative, not absolute.

Measure the safe period. A woman's menstrual cycle is generally 28 days.

Menstruation occurs 14 days after ovulation.

Menstruation usually lasts 3 to 7 days.

Ovulation occurs again a week after menstruation.

The first seven and the last eight are the days when there is no ovulation.

Three days after menstruation is considered a safe period.

Ovulation is generally not made during this time.

That is, you generally do not get pregnant.

7 days before menstruation and 8 days after menstruation! It's 8 days after coming, not 8 days after cleaning! Ovulation is 8 days after cleaning!

Not everyone can use the first 7 and the last 8 for contraception! People with short menstrual cycles can't use it! For example, if you have a shorter period, you will enter the ovulation period on the 8th day after your menstruation!

7 days before and 8 days after the menstrual period is the safe period for women's physiology, that is, the non-ovulation date.

But now for a variety of reasons.

Women's cycles are not very accurate.

Try not to rely solely on this kind of extrapolation.

The first 7 days and 8 days after the big aunt comes, the girl does not ovulate, which is the safe period of xxoo.

However, the safe period is not completely safe.

The first seven and eight days before menstruation refers to the 7 days before menstruation and 8 days after menstruation is safer, in fact, it is a misleading, the safe period refers to the ovulation period and the days outside the menstrual period, (menstrual regularity) the 14th day before the next menstrual period is the ovulation day, and the first 5 days and the last 4 days of the day are the ovulation period. In addition to these few days, the rest is the safety period, of course, it is not 100% safe, and the later security period is generally safer.

The first seven and the last eight are contraceptive measures that rely on the estimation of the menstrual cycle.

The period from the first day of menstruation to the day before the start of ovulation is generally 8 days, which is the last 8. From the first day after the end of ovulation to the day before the next menstrual period, it is generally 7 days, which is the first 7.

This kind of contraceptive measure is only relatively effective, the so-called relatively speaking, it means that the probability of conception is smaller than that in other times in the time indicated in the "first seven and eight after eight", but it is not absolutely risk-free, and the risk of using this safe period of contraception is still relatively high compared to other contraceptive methods such as taking drugs and using contraceptives.

If a woman's menstrual cycle is less than 26 days, in general, the "first seven" can still be extrapolated as the safe period, while the "last eight" of the fiber fluid does not. Because of the influence of emotional, climate, environmental and other factors, rhythmic contraception may cause early, delayed or even additional ovulation, so it is not so absolutely safe.

Menstrual cycle:

The method of calculating ovulation according to the menstrual cycle is also known as the calendar method. Both menstruation and ovulation are affected by the endocrine hormones of the pituitary gland and ovaries and show cyclical changes, and the length of the cycle chain of the two is the same, both are 1 cycle per month, and ovulation occurs in the middle of two menstruations.

Women's menstrual cycles can be long and short, but the interval between the day of ovulation and the start of the next menstrual period is relatively fixed, usually around 14 days. Based on this relationship between ovulation and menstruation, ovulation can be calculated based on the menstrual cycle. The calculation method is calculated from the first day of the next menstrual period, and the 14 days backward or subtracted 14 days is the ovulation day, and the ovulation day and the first 5 days and the last 4 days together are called ovulation.

This is the rationale for the rhythm method.

Seven days before a woman's period and eight days after her period, i.e. the days when she is less likely to get pregnant.

In fact, the first seven fingers are the first 7 days of menstruation, and the last eight refers to the first day from the menstrual period to the eighth day.

But in fact, there is an error rate in this statement, because everyone's physiological situation is different, and ovulation is likely to be caused by menstruation and cannot be punctual, so for female friends with chaotic menstruation, in fact, the so-called safe period itself is of little significance. By judging the so-called "first seven and last eight", people only say that they can reduce the probability of people getting pregnant, but this method is not a completely contraceptive method.

The first seven days and the last eight days mean the seven days before a woman's menstrual period and the eight days after her menstruation, that is, the days when she is less likely to get pregnant.

First of all, the contraceptive measures mentioned in the first seven and eight are relatively effective, and the so-called relative means that the probability of conception in the time specified in the "first seven and eight after eight" is smaller than that in other times, but it is not absolutely risk-free.

A person's body temperature fluctuates due to the influence of the external environment and the internal activities of the body, and in order to eliminate these external and internal influences, the body temperature before waking up at 6-7 o'clock in the morning is often used as the basal body temperature. Basal body temperature is the lowest body temperature in a human body during a day and night.

Although the method of measuring basal body temperature is simple, it is demanding and requires long-term adherence. Before the measurement, prepare a thermometer and a record sheet to record the basal body temperature, from the beginning of the menstrual period, before getting up in the early morning of each day, without talking and doing any activity, put the thermometer in the mouth for 5 minutes, and then record the measured body temperature on the body temperature record sheet.

Pay attention to the problem in the first seven and eight in the back

The first step in using safe contraception is to accurately measure ovulation. Each of the three methods used to determine ovulation has its own advantages and disadvantages: the calendar method can be used to estimate the ovulation period and the safe periods before and after ovulation.

However, it is only suitable for women with normal menstruation, and it is sometimes inaccurate due to changes in the environment and mood that cause ovulation to be early or delayed.

The basal body temperature measurement method can determine the date of ovulation and the safe period after ovulation, but cannot measure the safe period before ovulation, which is more troublesome and strict, if the body temperature is not measured in accordance with the regulations, the ovulation date cannot be accurately determined.

The cervical mucus observation method can measure the ovulation period and the safe period before and after ovulation, and the accuracy is high, but the user must be trained and fully mastered before using it. If these three methods are used together, they can make the most of their strengths and avoid their weaknesses, and the results will be greater.

The above content reference: Encyclopedia - the first seven and the last eight.