When a woman has stretched white ribbon, she is usually ovulating, but the phenomenon of negative ovulation test paper may occur because ovulation has not yet reached its peak, so the result of negative ovulation test paper appears. It may also be caused by errors in ovulation test paper monitoring, because in clinical practice, there is a certain amount of error in ovulation test paper monitoring, so it can also lead to negative ovulation test paper results. It is also possible that ovulation is caused by the wrong method of ovulation. The appearance of leucorrhea is an important reaction to normal ovulation, so you cannot rely on one ovulation test to determine whether you are ovulating. Women can also use time to predict whether they are ovulating or not. Usually ovulation occurs 14 days before the next menstrual period, and can also be monitored by ultrasound for ovulation.