1, period projection method: regular menstruation, ovulation is calculated as follows: the first day of the next menstrual flow, count backwards 14 days or minus 14 days is the day of ovulation, ovulation day and its first 5 days and the next 4 days together is called the ovulation period. 2.Basal body temperature method: Before going to bed, dump the thermometer to a low point and place it next to your bed. Sleep for more than 6-8 hours and measure the temperature in the morning after waking up, without getting up, eating or talking, and then record the degree on the thermometer. The temperature needs to be taken without interruption for at least one menstrual cycle. Generally, during the first half of the menstrual cycle, the body temperature is low, called the low temperature period. After ovulation, the temperature rises gradually and reaches a high temperature plateau after 2-3 days, which is called the high temperature period. These two steps in the body temperature curve are called biphasic body temperature. If the temperature is biphasic, it indicates ovulation, but if the temperature is monophasic, it often indicates that there is no ovulation. 3. Ovulation monitoring with ovulation test paper: Measure at the same time every day. Do not drink more water 2-3 hours before the test, because the diluted urine sample will hinder the detection of LH peak. Ovulation usually occurs 24-48 hours after a positive ovulation test. 4. Ultrasound ovulation monitoring: Ultrasound monitoring is the most accurate and requires a visit to the hospital around the 11th day of the menstrual cycle for continuous monitoring, usually 4-6 times a cycle, or possibly more, which takes more time and money.