When the ovulation test paper is weakly positive, it is generally due to the luteal hormone in the female body. When it does not reach the peak, it will appear weakly positive when it is tested with the ovulation test paper. If the progesterone in the female body reaches the peak, ovulation occurs. After ovulation, the progesterone in the female body will decline. If the ovulation test paper is used at this time, weak positive will also appear. For women with regular menstruation, they usually begin to measure with ovulation test paper about the 10th day after menstruation. When the ovulation test paper shows from weak to strong, it means that women begin to ovulate.