The best time for follicle monitoring has some individual variability and is usually started from the 10th day of menstruation, or in some patients, from early menstruation. Follicle monitoring can be performed for menstrual irregularities or other causes of infertility to improve the chances of conception. In general, women can be tested under ultrasound on the 10th day after their menstrual period and then decide when the next test will be performed depending on the size of the follicles. Intercourse is recommended when the follicles reach a certain size and can treat infertility. Patients who are not in the hospital can be tested with a temperature test or a pregnancy test. For patients undergoing IVF, follicle testing can be started on the 2nd day of menstruation. Patients who need follicle testing are advised to decide the best time to test their follicles based on a combination of specific requirements in order to improve their chances of conception.