Ovulation test paper on the 10th day of menstruation shows a white plate, there are several reasons: 1, ovulation test paper expired, you can choose a new test paper to test, or use other brands of test paper, to test again.2, not reached the day of ovulation, each woman’s ovulation day is different, with the change of the menstrual cycle, the day of ovulation will also change. In the first half of the menstrual cycle before ovulation, the length of time varies for each woman, while in the second half of the ovulation, usually only about 14 days, the time is more stable. So the way to predict ovulation is to go forward about 14 days from the predicted time of the next menstrual period. For example, the 1st menstruation, the usual menstruation is 28 days, the next menstrual cycle should be in the 28th or 29th or so, the day of ovulation should be the 14th. 3, this month did not ovulate, because women do not ovulate every month, some special period affected by emotional or other environmental factors, resulting in changes in hormone levels, which may lead to this month does not ovulate.