Ovulation test paper strong positive to menstruation has the following two possibilities: First, in the ovulation period through the urine test appeared ovulation test paper strong positive, indicating that the body of the luteinizing hormone to reach its peak, in this period due to the body of estrogen fluctuation changes lead to the endometrium to lose the support of hormones, which caused by bleeding, mistakenly thought to be a menstruation, in fact, it is ovulation bleeding. The chances of pregnancy are higher at this time, but it is not recommended to have intercourse at this time, so as not to cause pelvic inflammatory disease affecting women’s health because of bleeding intercourse. Second, the occurrence of biochemical pregnancy, fertilized egg formation in order to maintain the needs of normal pregnancy, luteinizing hormone has been maintained at a high level, so the ovulation test paper monitoring will appear positive, due to a variety of reasons leading to the failure of fertilized egg implantation and the occurrence of miscarriage, so menstruation will come.