If a pregnant woman is more than 4 weeks pregnant and the HCG is only 600mIU/mL, this is actually a relatively normal phenomenon and there is no need to worry too much. If the HCG exceeds 1200mIU/mL, it is normal if the HCG growth and doubling is good and the embryo quality is relatively good. If the HCG does not increase or fails to double, it is likely that the embryo quality is not good and the chance of stopping the pregnancy is high.