How many days is the female menstrual cycle? What are the stages of menstrual cycle?

We have many names for women's menstruation, such as menstruation, menstruation, menstruation and kindness. The duration of a menstrual cycle is called "menstrual period" for short, and the interval between two menstrual cycles is called "menstrual cycle". So how many days is the female menstrual cycle? What are the stages of menstrual cycle?

1, menstrual cycle

The so-called menstrual cycle is that the first day of the menstrual period is counted as the first day of the cycle until the day before the next menstruation, which is called a menstrual cycle. Generally speaking, it is about 26-35 days.

The menstrual cycle can be divided into two stages:

The first stage, that is, from the first day of menstrual cramps to the day of ovulation, is about 12-22 days, which varies with people's physique. I take the 28-day cycle as an example: menstruation lasts about 3-5 days, and on the seventh day, the pituitary gland secretes hormones to stimulate the development of eggs. When the egg matures, the pituitary gland will begin to secrete estrogen.

In the second stage, everyone's time is roughly the same, that is, from the day of ovulation to the next menstrual cramp, usually two weeks after ovulation, that is, 14 days, which is the day of menstrual cramp. During this period, mature eggs will pass through the fallopian tubes and then enter the uterus, that is, during ovulation, which is about 24-48 hours. At this time, the concentration of estrogen will decrease and progesterone will increase, so that the endometrium will continue to thicken and the fertilized egg will be implanted. If the sperm just enters at this time, it will form a fertilized egg. But if there is no fertilization, the egg will shrink after 1-2 days in the uterus, and then the thickened endometrium will naturally fall off in about two weeks, and the next menstruation will start again, and so on.

After reading the above explanation, you will find that in the whole menstrual cycle, the probability of an egg actually getting pregnant is only 1-2 days. If you want to avoid contraception, do you just need to avoid these two days?

Not really, because you have to worry about sperm. Sperm can live for about 72 hours after entering the uterus, that is, three days. Therefore, in order to prevent the sperm left in the uterus three days before ovulation from combining with the eggs just discharged, the dangerous period is advanced by three days, otherwise it is a safe period.

Some people's menstrual cycle is quite regular and easy to calculate, while some people occasionally have a few days' error. Of course, some people will change their menstrual cycle because of individual factors such as mood, stress, insomnia, illness and exercise. If you want to calculate your menstrual cycle more accurately, you may have to calculate the cycle of about six months to get the longest cycle and the shortest cycle.

2. Unsafe contraceptive methods

(1) safe period contraception

In fact, because some women have irregular menstruation, it is impossible to calculate the ovulation period. Even if menstruation is regular, the monthly ovulation period may fluctuate, and the time may be wrong. Therefore, the "safety period" is actually not safe, and many women are recruited in the so-called safety period.

(2) Interrupting contraception during sexual intercourse

Because men have a small amount of sperm flowing out before ejaculation, the number is enough to make women pregnant. Moreover, this method requires the man's self-control, which is not easy to master and has a high failure rate.

(3) Emergency contraception

This medicine is only effective for unprotected sex once, and the effective rate is obviously lower than that of conventional contraceptive methods. Moreover, the emergency contraceptive has a large dose of hormones and great side effects, which can easily cause menstrual disorder and irregular bleeding and cannot replace the conventional contraceptive methods.

(4) Incorrect use of condoms

I don't wear it every time I have sex, or I don't wear it since I was in the same room, but I don't wear it until I feel ejaculation.