It is normal for the ovulation test paper to remain strongly positive for three days, indicating that ovulation is about to occur. Ovulation tests work by detecting changes in luteinizing hormone levels in the urine. As the follicle matures, the luteinizing hormone in the body will continue to rise and reach its peak. Therefore, if the luteinizing hormone level in the urine becomes high, it means that ovulation may be imminent. This time is usually maintained for about 48 hours, so if the ovulation test paper continues to be strong positive for three days, the patient can not worry, usually this situation will be maintained for about 2 to 3 days will gradually turn negative, which indicates that ovulation has occurred. If the ovulation test paper continues to be strongly positive or there are other uncomfortable symptoms, it is recommended to consult a doctor in time, with the help of the doctor to clarify the cause of the disease, and to carry out targeted treatment or therapy.