Under normal circumstances, if you use an ovulation test strip to test your urine during ovulation, and the test result shows a strong positive result, it means that ovulation will occur within the next 24-36 hours. If the test does not show a strong positive result, there are several reasons: 1) the test strip may not be accurate enough; 2) ovulation may not occur in this menstrual cycle, everyone’s situation is different, and not every menstrual period has ovulation; 3) ovulation may not have arrived yet, the calculation of ovulation is based on the menstrual cycle. If the menstrual cycle has been regular, the ovulation day should be the 14th day before the next period. Sometimes, due to environmental factors and other changes, the menstrual cycle may change; 4. Perhaps ovulation has already occurred and the ovulation test has gradually changed from strong positive to weak.