6 weeks pregnant blood HCG level should be 10,000-100,000 mIU/mL, HCG more than 30,000, if the rising trend is good, usually is normal, if the rise is slow or not rise instead of fall, accompanied by abdominal pain and other symptoms, usually is not normal. Generally in 6 weeks of pregnancy, through the changes in HCG indicators, you can determine the development of the gestational sac, a single blood HCG indicators reference significance is not great, need to be monitored dynamically, if the indicators are too low or slow to rise, the embryo is considered to be developing abnormally, and the follow-up does not exclude the possibility of preeclampsia or miscarriage. It is recommended that pregnant women pay attention to regular obstetric examination during pregnancy, combined with ultrasound and clinical symptoms, whether there is vaginal bleeding or abdominal pain, etc., to comprehensively determine the development of the embryo, there are abnormalities recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examinations, to clarify the cause of the disease, and to take the appropriate treatment measures.