HCG values between 4500-16000mIU/ml on the 40th day of pregnancy are normal. HCG values rise faster during early pregnancy, usually doubling in about 1.7 days. It is better to take blood test regularly. HCG test is important for early pregnancy diagnosis and can be used to diagnose pregnancy-related diseases, trophoblastic tumors and other diseases. If the HCG value is low and accompanied by abdominal pain, it is recommended to go to the hospital immediately to check whether the level of progesterone is too low, and according to the doctor’s advice, timely supplementation of progesterone to avoid miscarriage. If the HCG value is high, there is a possibility of twin pregnancy, in which case the HCG value is usually more than double that of a single fetus, but there is also a possibility of hyperemesis gravidarum. If the HCG value is high, it is important to monitor it closely to check whether it is a twin or a gravid fetus. The development of the fetus is unstable in early pregnancy, it is better to pay attention to rest and strengthen the diet and nutrition. It is recommended to eat more food containing vitamin E, such as eggs, lean meat, cod liver oil, etc., which has the effect of preserving the fetus. The pregnancy sac usually enters the uterine cavity on the 40th day of pregnancy, and it is recommended to carry out ultrasound examination in time to exclude ectopic pregnancy.