How do female friends calculate the ovulation period? Many female friends have been pregnant for a long time but still can’t get pregnant, so they always want to calculate their ovulation period accurately, so that they can make themselves pregnant faster. How does the ovulation calculator calculate the exact date? There are many ways to calculate the ovulation period. We can take time to find out. Female ovulation is cyclically changed by the endocrine hormones of the pituitary gland and ovary. The length of the two cycles is the same, one cycle per month, and ovulation occurs in the middle of two menstrual cycles. Women’s menstrual cycle is long and short, but the interval between the ovulation day and the beginning of the next menstrual period is relatively fixed, usually around 14 days. According to this relationship between ovulation and menstruation, the ovulation period can be calculated according to the menstrual cycle. The calculation method is calculated from the first day of the next menstrual cramp, and the last 14 days or 14 days is the ovulation day. The ovulation day and the first 5 days and the last 4 days are called ovulation. This is also the theoretical basis for the contraceptive method in the safe period, because in the menstrual cycle, except for the menstrual period and the ovulation period, the rest of the time is a safe period. Taking the menstrual cycle as 30 days as an example, the first day of the menstrual cramp is on September 29, then the next menstrual cramp is on October 29 (September 29 plus 30 days), and then from October. On the 29th, minus 14 days, October 15th is the ovulation day. The ovulation day and the first 5 days and the last 4 days, that is, from October 10-19, the ten days are ovulation. To estimate the ovulation period by this method, we must first know the length of the menstrual cycle, that is, to have a normal or regular menstrual cycle, in order to calculate the start date of the next menstrual cramp and then calculate the ovulation period, so only Suitable for women who have always had a normal menstrual cycle. If the menstrual cycle is irregular or abnormal, the date of the next menstrual cramp can not be derived, so it is impossible to estimate the ovulation date and ovulation period. If the menstrual cycle is regular, the ovulation period of women is generally about 14 days before the next menstrual cramp. The first 5 days and the last 4 days of the ovulation day, together with the ovulation day, are called ovulation. If the menstrual period is unstable, when is your ovulation period calculated: the first day of ovulation = the shortest one of the menstrual cycle days minus 18 days, the last day of ovulation period = the longest menstrual cycle days minus 11 days . The calculation method is based on the first day of the menstrual cramp, and the number of days is counted backward.