A strong positive ovulation test 6 days before menstruation is likely to be ovulation, but it cannot be ruled out that it is caused by the quality of the ovulation test paper. For women with regular periods, ovulation occurs about 14 days before the next menstrual period, but of course this time is not fixed. Due to a variety of factors, it is possible to delay the period, which affects the ovulation period, resulting in ovulation test paper 6 days before menstruation to detect a strong positive. Problems with the quality of ovulation test strips, such as expiration, moisture, contamination, etc., or irregularities in the test can lead to inaccurate results and strong positive ovulation test strips 6 days before menstruation. If a woman tests strongly positive with ovulation test paper 6 days before her period, she can be monitored by ultrasound to determine if she is ovulating. Monitoring ovulation with ovulation test paper alone is not highly accurate, and it is recommended to prepare for pregnancy scientifically under the guidance of a doctor.