What does it mean to test weakly positive on ovulation test paper ten days after it is strongly positive?

Ovulation test paper strong positive after ten days with ovulation test paper test weak positive indicates that ovulation has ended, usually belong to the normal phenomenon.
Ovulation test paper is used to predict whether ovulation has occurred by detecting the peak level of luteinizing hormone. It can be used to qualitatively detect luteinizing hormone in human urine, thus determining the time of ovulation and the “safe period” in a woman’s menstrual cycle, and achieving the purpose of choosing the best time to conceive or using the “safe period” for contraception.
Ovulation test paper strong positive after ten days with ovulation test paper test weak positive because the end of ovulation caused luteinizing hormone value decreased, through the ovulation test paper test will appear weak positive results, this is a normal phenomenon.