HCG value at 6 weeks of pregnancy usually rises to 10,000 to 100,000 IU/ml, while 8,000 IU/ml is lower than the normal value, which is usually abnormal, but not necessarily abnormal if the gestational week is calculated incorrectly. Generally, the reason why HCG value is lower than normal gestational week may be due to abnormalities and poor development of the embryo, such as chromosomal abnormality of the fetus due to viral infections, drug use and other factors; it is also possible that HCG value will be lower than normal pregnancy when the location of the gestational sac is abnormal after pregnancy, i.e. ectopic pregnancy. If the actual pregnancy week is smaller than the calculated pregnancy week due to irregular menstruation and other reasons, then the blood HCG value should be measured according to the actual pregnancy week to see if it is normal, so it is not necessarily abnormal. Therefore, if you have a low HCG value at 6 weeks of pregnancy, you need to consult a doctor for diagnosis and treatment according to the specific cause.