Ovulation test strips are mainly used to detect the time of ovulation by retaining a woman’s urine. Usually women need to collect some urine in a clean container on the 10th day after menstruation, and then insert the test line with the arrow end of the ovulation test paper into the container of clean urine, but the plane of urine should not exceed the MAX marking line. Usually the test strip is left in the container for about 5 to 10 seconds before it is removed and placed flat and the result is observed. If only one red band appears, i.e., the control line is colored and the test line is not colored, then there is no ovulation. If two colored bands appear and the test line is equal to or darker than the control line, it means that the woman will ovulate within 24 to 48 hours. In addition, women are advised to buy ovulation test strips from regular sources and follow the instructions strictly to ensure the accuracy of the test results. In addition to using ovulation test strips, follicle monitoring under ultrasound can also be performed at the doctor’s office.