Ovulation test paper is used to detect the concentration of luteinizing hormone in the body to determine whether ovulation is occurring. A weakly positive ovulation test paper can indicate that there is still a low concentration of luteinizing hormone in the urine, because the corpus luteum has not yet completely shrunk, or the possibility of pregnancy is not ruled out. A weakly positive test result indicates that the concentration of luteinizing hormone is low, so if there is no discomfort or symptoms, you can continue to observe. If your period is overdue for more than 5 days, you can buy an early pregnancy test. If pregnancy is ruled out, it is possible that the luteal atrophy is incomplete and the endometrium may continue to grow, resulting in excessive growth of the endometrium and a larger volume when you have your period.