When the patient has vaginal bleeding during the menstrual period, but the examination shows that she is pregnant, it mainly suggests the following three possibilities: First, the results of the examination are wrong, due to the quality of the test paper purchased by the patient is not the same, as well as the patient in the process of measurement or observation of the results of the process there may be a mistake, so false positives, so the patient needs to be further examined by the blood chorionic gonadotropin for confirmation. Second, biochemical pregnancy, biochemical pregnancy refers to the laboratory examination shows pregnancy, but ultrasound can not see the presence of the gestational sac, with the patient’s menstrual flow of abortion. Thirdly, abnormal vaginal bleeding caused by preeclampsia or ectopic pregnancy is considered. Patients need to dynamically observe the changes in blood chorionic gonadotropin, progesterone and ultrasound to confirm the diagnosis and determine the treatment plan according to the results of the examination.