Ultrasound single suggests small dark area is not necessarily not pregnant, should be combined with the value of human chorionic gonadotropin comprehensive judgment, if more than the normal range is the state of pregnancy. If menstruation is regular, the menstrual cycle is 28-30 days, within 35 days of menopause, ultrasound can detect a small gestational sac, but not the yolk sac, ultrasound often suggests a small dark area, whether or not pregnancy should be combined with human chorionic gonadotropin values to determine a comprehensive. If HCG is higher than the normal range, it is a pregnancy status. If HCG is within the normal range, it may be blood or fluid accumulation in the uterine cavity. If there is a delay in menstruation and pregnancy is suspected, you can take an early pregnancy test at home to make a preliminary judgment, and then go to the obstetrics clinic to take a blood test for HCG to determine whether you are pregnant or not, the sensitivity of blood HCG is higher than that of urine HCG. ultrasound examination reveals that there is a gestational sac in the uterus, which will determine the pregnancy in the uterus. During pregnancy, pay attention to rest more, at the same time should relax, avoid tension, anxiety, any discomfort should be timely to the hospital, the doctor to clarify the diagnosis, and cooperate with the doctor to deal with the symptoms.