How likely is it for a woman to get pregnant during the safe period?

　　The safe period is a very difficult period for women, because many couples hope to have sex during the safe period, but are afraid of inaccurate calculations and do not dare to use this method. Therefore, many people ask female safe period What are the chances of pregnancy? What are the methods for calculating the safety period? Next, I will introduce them one by one for your reference.

　　What is the probability of a woman getting pregnant during the safe period?

　　1. The contraceptive effect is not strong during the safe period, and the annual failure rate is about 25%.

　　According to data from the World Health Organization, under ideal conditions, the annual failure rate of contraception during the safe period is about 5%, which is less reliable than condoms and oral short-acting contraceptives. In fact, it is difficult to achieve the ideal state of controlling the failure rate at 5%. If a simpler calculation method is used, or the menstrual cycle is irregular, the failure rate will be greatly increased. clinical The tracking annual failure rate can reach more than 25%. A failure rate of 25% means that for 100 adult women using this method for contraception, 25 women will become pregnant within one year. The word "safe" in the name confuses many people, but in fact the risk is very high. From this point of view, compared with existing reliable contraceptive methods, low effectiveness has almost become the biggest "side effect" of this type of natural method. Can you accept it?

　　2. Calculate the safe period and basically build your character.

　　The safe period calculation method we often hear is a simple estimate like "first seven and last eight" or "first three and last four", but it is only calculated based on the most recent menstrual cycle. For such an algorithm to be accurate, it requires that women's menstrual cycles must always be as punctual as a clock. In fact, not all women ovulate regularly. Even for women who ovulate regularly, their menstrual cycles will be affected by environment, emotions, healthy It fluctuates due to the influence of the situation, and it is impossible to guarantee complete punctuality. Therefore, such calculations will bring large errors.

　　In order to reduce such errors, there are also some relatively more accurate safe period calculation methods, such as Ogino's formula. This method involves recording the menstrual cycles of the last 6 to 12 months, and selecting the values ​​of the longest and shortest cycles as important parameters to calculate the safe period. The menstrual cycle is defined as the period from the first day of menstruation to the day before the next menstrual period.

　　Although this method is more reliable than simple estimation, because it seems that it uses the longest and shortest values ​​in multiple periods to flatten the fluctuations of the period. But it is very troublesome to use, and even so, it cannot escape the influence of uncertainties. Calculating the accurate period is almost a small probability event. Relying on periodic contraception is basically a matter of luck and character.

　　In addition, some other factors may also affect Calculation of safety period . The safe period is generally calculated by women based on their observed menstrual cycles, but in fact vaginal bleeding may not be real menstrual blood, and may also be ovulation bleeding or other conditions. If the bleeding in this situation is mistakenly calculated as menstruation, it will also lead to inaccurate calculation of the safe period.

　　How to calculate the safe period for women have These four

　　1. Standard date method

　　For women whose menstrual cycles are within the range of 26 to 32 days and are regular, counting from the first day of menstruation, the 8th to 19th day of the cycle can be regarded as the fertile period and should not have sexual intercourse.

　　2. Calculation method

　　Counting from the first day of the next menstrual period, the 14 days countdown or minus 14 days is the ovulation day. The ovulation day and the 5 days before and 4 days after the ovulation are called the ovulation period. This is the theoretical basis of the safe period contraceptive method.

　　For example: a woman's menstrual cycle is 28 days, and the first day of this menstrual period is December 2, then the next menstrual period will be on December 30 (December 2 plus 28 days), and then subtract 14 days from December 30, then December 16 is the day of ovulation. The ovulation day and the 5 days before and 4 days after it, that is, December 11 to 20, are the ovulation period. Except for the menstrual period and ovulation period, the rest of the time are safe periods.

　　3. Basal body temperature measurement method

　　Basal body temperature is also called resting body temperature. After a woman ovulates, progesterone secretion increases, which can increase basal body temperature (by more than 0.3 degrees Celsius), indicating that ovulation has been completed. The day when the body temperature in the body temperature record chart goes from low to high is the day of ovulation. The 5 days before the ovulation day and the 3 consecutive days thereafter are the fertile period and it is not suitable to have sex.

　　4. Cervical mucus observation method

　　The time of ovulation can be observed based on the physical and chemical properties of cervical mucus. After the menstrual period, because the level of estrogen is still relatively low, the secretion of cervical mucus is very little, and women have no liquid feeling at the vaginal opening, which is also called the "dry period." As the level of estrogen increases, the amount of cervical mucus increases. Women can use two fingers to take the mucus from the vaginal opening. The cervical mucus is thin and transparent near the ovulation period, which is called the "peak day". The period with mucus is the period of easy pregnancy and it is not suitable to have sex. You can only have sex 3 days after the dry period and mucus peak period. want to be in Safe period contraception If so, you might as well try this method of calculating a woman’s safe period.