The duration of a weak positive ovulation test is uncertain, usually around one week is normal, and the duration of a weak positive test does not have much significance in determining whether ovulation is normal or not, and is not a test result that needs to be referred to. When a strong positive ovulation test result appears and then turns into a weak positive test result, it means that ovulation has already started, and you can arrange intercourse after a weak positive test result, because the fertility of the egg is strongest within 36 hours after the egg is mature and expelled. This means that ovulation has not yet started and continuous testing is needed. The development of the follicles in the ovaries can be checked directly by ultrasound, which allows you to visualize the size of the follicles and the ovulation situation.