What is the normal range of HCG at 40 days pregnant?

On the 40th day of pregnancy, the normal range of blood HCG value is 10000-100000mIU/mL, followed by reexamination every other day. If HCG value doubles, it is considered ectopic pregnancy; if it does not double, B-ultrasound detection is needed after seven weeks of pregnancy to check the size of gestational sac and the development of embryo.