How does ovulation test paper detect weak yang before menstruation return a responsibility

Ovulation test paper detects luteinizing hormone in urine. When luteinizing hormone in urine reaches its peak, it will show strong positive after test paper detection. After strong positive performance, ovulation will be shown about 24-48 hours, which can improve the probability of pregnancy in the same room. If ovulation test paper has been weak positive, it may be caused by the following reasons: First, there may be no ovulation will show weak positive. Second, it may be that the ovulation test paper is expired or contaminated, and there is no strong positive in clinical detection. Third, it is recommended to change the brand of test paper to see if it will show strong positive. If it still does not show strong positive, it is recommended to check the growth and development of follicles through B ultrasound, and understand whether there is ovulation in clinical practice.