Two bars on the ovulation test means a strong positive test. A strong positive test means that the value of luteinizing hormone has reached its peak before a strong positive test occurs. When a strong positive test appears, ovulation will occur around 24-48 hours later, which is the clinical significance of the ovulation test, while one bar appears on the early pregnancy test, which detects the HCG level in the urine. Therefore, the presence of a bar at this time when ovulation has not yet occurred is a normal phenomenon, because there is no pregnancy at this time, so the purpose of ovulation test and early pregnancy test is not the same in clinical practice. Ovulation test paper detects the amount of luteinizing hormone in the urine, while early pregnancy test paper detects the concentration of HCG in the urine, so the two have different meanings and different purposes of detection.