1, menstrual cycle law
For women with regular menstrual cycle, the safety period can be calculated according to the time of menstrual cycle and ovulation period. Generally, women's menstrual cycle is 2 1-35 days, and the ovulation day is about 14 days before the next menstrual cramp. The first 5 days and the last 4 days of the ovulation day together are called ovulation period, except the ovulation period and menstrual period, which belong to the safe period.
2, measuring the basic body
Women with irregular menstruation can determine the safe period by measuring the basal body temperature, and the progesterone level of women can be judged by measuring the basal body temperature. If ovulation occurs during normal menstruation, the basal body temperature will be biphasic, which can be used to determine that the ovulation date of women is 4-5 days before and after ovulation, and the rest of the time is generally a safe period except menstrual period and ovulation period.
3. Cervical mucus examination
Cervical mucus is a kind of vaginal secretion. During ovulation, the cervical mucus of women begins to increase, and its color is clear and smooth, similar to egg white. After ovulation, cervical mucus begins to thicken or may disappear completely.
What is the female safety period?
Women's safety period refers to the period from the end of the last ovulation period to the next ovulation period. Generally speaking, if women's menstrual cycle is 28 days, and the first 1 day of menstrual cramps is 7 days before and 8 days after, this period of time is the safety period.