To determine whether you are having a period or a biochemical (pregnancy), you need to go to the hospital to have a blood test to check the level of human chorionic gonadotropin. 1. Biochemical pregnancy: refers to the situation where sperm and egg have united and formed a fertilized egg, but the fertilized egg does not successfully implant in the uterus and then terminates naturally. The patient does not have any abnormal symptoms, or the chorionic gonadotropin value will be elevated at this time, presenting a state of pregnancy, but with the onset of menstruation, the value of the reexamination returned to normal levels. Delayed menstruation for only a few days and a slightly heavy menstrual flow usually require no treatment. One biochemical pregnancy has no effect on future pregnancies and health, but multiple biochemical pregnancies require examination in the hospital to find the cause. 2. Menstruation: If a woman’s menstrual period is normal or delayed, she can go to the hospital to have her blood drawn to check the level of chorionic gonadotropin, which is within the normal range to make it clear that she is having her menstrual period. Women should pay attention to personal hygiene, maintain a good mood, once the menstrual cycle has prolonged or other discomfort, it is recommended to go to the hospital in a timely manner, under the guidance of a professional doctor, a clear diagnosis of biochemical pregnancy or the onset of menstruation.