In the case of regular menstrual cycle, the best time for ovulation monitoring is usually around the 9th day of menstruation, if the menstrual cycle is unstable, it is more difficult to accurately determine the time for ovulation monitoring. Usually, if a woman has the need to prepare for pregnancy, she should go to the hospital in time for a detailed examination, and use ultrasound to monitor ovulation under the guidance of the doctor to detect the size of the follicle around the ninth day of menstruation, and monitor it every 2-3 days to determine whether it meets the criteria for pregnancy according to her own actual situation. Female ovulation monitoring can also use ovulation test paper self-test, to urine as a specimen, generally choose between 8-10 am urine is better. If monitoring is difficult, you should go to the hospital in time, the doctor will be based on the progress of follicular growth to guide, follow the doctor’s guidance and advice can be.