The period is also known as menstruation, the danger period is also known as the ovulation period, 6 to menstruation according to the number of days of the usual menstrual cycle to determine the day of ovulation, usually 30 days or so to a menstrual period, consider the 22nd is the day of ovulation, 17-26 belongs to the period of ovulation, plus or minus 3 days during this period, 14-29 days for the danger period. Push to the woman’s ovulation time, according to the usual menstrual cycle, the time of menstruation to understand, the usual menstrual cycle has a regularity, projected ovulation time will be more accurate, the next menstrual period 14 days before the onset of the day belongs to the day of ovulation, the 5 days before and after the day of ovulation and 4 days after the day of ovulation belongs to the period of ovulation. During the ovulation stage, there are mature follicles discharged from the woman and then go to arrange intercourse, the chances of conception will be greater, but not all women can get pregnant successfully, the specific also depends on whether the man and the woman have the ability to reproduce. Women can also use ovulation test paper and ultrasound to monitor ovulation and learn about the development and discharge of follicles.