To determine which day is the day of ovulation, the more common methods are as follows: 1, women with regular menstrual cycles, generally 14 days before the next menstrual period is the day of ovulation, this method is only a rough method of detection. 2, women can be cleaned up after menstruation daily with ovulation test strips to detect, the beginning of the time is negative and gradually detected to the positive, generally is the day of ovulation. 3, the use of the 12th -13th day of menstrual cycle daily ultrasound to check the follicle development, and then the day of ovulation is the day of ovulation. On the 12th -13th day of the menstrual cycle, ultrasound is done daily to check the development of the follicles. If the follicle develops to about two centimeters, ovulation will occur soon, and in the second day of ultrasound detection follicles have disappeared, then the day before is the day of ovulation. 4, you can also be measured by the basal body temperature, in the day of ovulation when the body temperature will be slightly lower, the body temperature will be higher after ovulation. 5, through the observation of leukorrhea secretion, generally appear to be colorless and transparent, the high degree of pulling when it is the day of ovulation, with two, The three methods are more accurate.