The normal value of HCG is 0-5. If the HCG is within the normal range, it proves that there is no pregnancy. The body secretes a special hormone called chorionic gonadotropin, or HCG, after pregnancy, which doubles as the number of days of menopause increases, and the level of HCG in the blood can be monitored to determine qualitatively if you are pregnant. If the HCG level is high, pregnancy is confirmed, but to determine intrauterine pregnancy, to exclude ectopic pregnancy and to see how the embryo is developing, it is still necessary to rely on ultrasound examination in obstetrics and gynecology. If the patient has regular menstruation, the gestational sac can be monitored by transvaginal ultrasound at about 35 days of menopause, the fetal bud can be seen at about 42 days of menopause, and the fetal heartbeat can be seen at about 49 days of menopause, which is the real meaning of live intrauterine fetus. If there is a history of menopause but the blood HCG is within the normal range, it proves that the pregnancy is not temporary. It is recommended to perform an ultrasound to see the thickness of the endometrium, and if the endometrium is thick, it is recommended to perform a progesterone withdrawal test, which may be related to the current menstruation, delayed ovulation or absence of ovulation.