If the body temperature is significantly higher than before by 0.3℃-0.5℃, it generally indicates ovulation; 2. If the red line of the urine test strip gradually becomes red, especially when it is obviously strong, it generally indicates that ovulation is imminent; 3.B-ultrasound monitoring: detecting the gradual growth and discharge of follicles by ultrasound is very accurate and is the gold standard for monitoring the presence or absence of ovulation. Generally, for women with regular menstruation and a cycle of about 30 days, the first ultrasound is done about 3 times in a cycle, that is, the first ultrasound is done on the 10th-12th day of the menstrual cycle, and the next monitoring is done about 3 days according to the size of the developing follicles, if the follicles grow up, coitus can be guided, and after coitus, the monitoring is done in the hospital to clarify whether there is ovulation or not.