Based on the special physiology of women, women go through a safe period, ovulation period and menstruation period in a month. What is the safe period? How much do you know about the safety period? A. What is the safe period Normal women of childbearing age have a menstrual cycle every 28 days or so, from the beginning of the current menstrual flow to the first day of the next menstrual flow, called a menstrual cycle. In terms of contraception, each menstrual cycle can be divided into menstrual period, ovulation period and safe period. Ovulation contraception is a contraceptive method to stop sexual intercourse during ovulation. The woman’s safety period refers to which days The ovulation date is usually about 14 days before the next menstrual period. The first day of the next menstrual period, count backwards 14 days or minus 14 days is the day of ovulation, the day of ovulation and its 5 days before and 4 days after together is called the ovulation period easy to conceive. In addition to this, the possibility of pregnancy can be ruled out when it is the safe period. Safety period contraception is a period of time during which a woman is infertile, based on her ovulation period and the survival time of sperm and eggs in the female reproductive tract, so she chooses to have intercourse during this time to achieve the purpose of contraception. Usually ovulation is usually within 2 days before and after the 14th day of menstruation, so the safe period is about 10 days after menstruation, and after the 20th day of menstruation to the next menstrual flow, the closer to the menstrual period, the greater the possibility of contraception. Third, safe period contraception is reliable safe period contraception is based on female ovulation and sperm, eggs in the female reproductive tract survival time, so you can project a period of non-conception, choose to carry out in this time, so you can achieve the effect of contraception. The success of contraception during the safe period depends on the knowledge of ovulation, and if there is a lack of knowledge in this area, safety is not possible. The success rate of contraception is 70% to 80%, mainly for women with regular menstruation. Women with irregular menstruation and those who took emergency contraceptives in the last cycle are not recommended to use the safe period contraceptive method. The safety period is divided into the pre-ovulatory safety period and the post-ovulatory safety period. The period from the day of menstruation to the day before the start of ovulation is the pre-ovulatory safety period. From the first day after the end of ovulation to the day before the next menstrual period is the post-ovulatory safety period. Generally speaking, the post-ovulatory safety period is safer than the pre-ovulatory safety period. This is because some women are sometimes affected by environmental changes and mood swings that make ovulation earlier, so that the pre-ovulatory safety period is shortened without their knowledge, so that the pre-ovulatory safety period is not very safe. The chances of the ovaries ovulating twice in a menstrual cycle are extremely small, that is, after ovulation until the next menstrual period, the second ovulation does not usually occur, so the post-ovulatory safety period is safer. The key to using safe period contraception is to determine a woman’s ovulation date. Even though some women may have symptoms such as lower abdominal pain, back pain, breast swelling and emotional changes, these phenomena are not specific to ovulation and therefore cannot be used as a basis for ovulation. Menstruation and ovulation are cyclical and there is a close relationship between the two. If you have a good grasp of the changes in the two, you can determine the date of ovulation by indirect methods. There are many ways to determine the date of ovulation, but the methods that women can master on their own are: projection based on the menstrual cycle, measurement of basal body temperature and observation of cervical mucus secretion. Generally speaking, women only ovulate once in a menstrual cycle, and the eggs have a certain survival time (related reading: egg survival time), so the safety period is to avoid this time, so it is relatively safe, but occasionally there are cases of early or postponed ovulation, or even two ovulations in a menstrual cycle, which is likely to lead to unwanted pregnancy. The physiological contraception is only applicable to couples with normal menstrual cycle, regular life and mutual cooperation, but its safety is not high, so women using this method should pay attention to the following points: 1, the safe period contraception method is only applicable to women with regular menstrual cycle. 2, because the female cycle will be affected by emotions and disease, the safety period alone to calculate contraception, the failure rate is high, so it is recommended that it should be used in conjunction with other contraceptive methods. 3. Calculating the safety period is not suitable for women whose menstrual cycle is less than 21 days and more than 35 days, and for women who are postpartum or breastfeeding. 4, from the oral contraceptive pill to the safety period contraception, in the first few months after stopping the pill is prone to irregular ovulation or extra ovulation, so these months as far as possible not to use the safety period contraception method to prevent contraceptive failure. 5, before using the safe period contraception, it is recommended that you first record the second half of the menstrual cycle, in order to understand the regularity of menstruation. 6, in addition to calculate the safety period, should also be combined with the measurement of basal body temperature, observation of leucorrhea changes to determine the date of ovulation, so as to better determine the contraceptive safety period. Therefore, the “safe period” contraception is not all safe, is not worth advocating. Please choose the best contraceptive method according to your specific situation. After all, a contraceptive failure will bring you serious physical and mental trauma.