Ovulation test strips are used to predict ovulation by detecting the peak level of luteinizing hormone LH. The peak level of luteinizing hormone in a woman’s urine 24-48 hours before ovulation will show a positive result with ovulation test strips. For women with a regular menstrual cycle of 28 days, urine can be taken at a fixed time every day starting around the 11th day of menstruation, and avoid drinking a lot of water to dilute the urine 2 hours before urination. If there are two bands on the ovulation test or a band darker than the control line, it means that the luteinizing hormone has peaked and ovulation will occur within 24-48 hours. If a red band appears on the test paper, it means that ovulation is not occurring. However, if there is no ribbon in the control area, i.e., no ribbon at all, which is called a blank slate, there is something wrong with the test. It is likely that the test method is incorrect or that the reagents are not working. In this case, the test should be retested with a new reagent strip. If there is still nothing showing, it means that there is something wrong with the test paper. So a test with a valid ovulation test paper will show at least one color band. In addition, ovulation test strips are mainly used to check if ovulation is occurring and when it is easy to get pregnant during intercourse, not to check if you are pregnant. If you want to check if you are pregnant, you can take a blood test 8-10 days after intercourse to determine if you are pregnant or you can take a urine enzyme immunoassay test.