In most cases, patients will ovulate when the ovulation test paper appears positive, but in the following cases, ovulation can not occur: first, when suffering from ovarian diseases, such as chocolate cysts or ovarian inflammation leading to follicular luteinization, the patient can not appear ovulation. A positive test only means that the patient has a peak of luteinizing hormone, which helps the patient to ovulate. Due to the thickening of the ovarian peritoneum, inflammatory stimulation or chocolate cysts, the follicle cannot rupture normally, the egg cannot be discharged, and the follicle continues to grow and develops into a cyst. Secondly, the accuracy of ovulation test paper is not 100%, especially when there is no continuous testing, but only occasional testing is even less accurate. If the patient ovulation test paper appeared positive, but coitus more than 6 months without pregnancy suggests that the test results may have errors, need to be further confirmed by ultrasound test ovulation.