A weak positive ovulation test before menstruation is normal and has no clinical significance. Ovulation test paper is through the detection of luteinizing hormone peak level to predict whether ovulation, so as to choose the best time to conceive or the purpose of safe period contraception. Ovulation test paper is a test method for women to detect and assist in the diagnosis of ovulation in vitro, only as an auxiliary means, the accuracy rate is not very high, there may be false positives or false negatives. If the menstrual cycle is usually regular, before menstruation ovulation test paper was weakly positive, may be false positive, not really ovarian ovulation, you can monitor the follicles under the ultrasound will be more accurate, if there is coitus during the ovulation period, coitus 10 days to extract the value of chorionic gonadotropin test, you can also know whether the pregnancy, the weak positivity of premenstrual ovulation test paper does not have a great deal of clinical significance.