In a normal intrauterine pregnancy, the blood value is the HCG value, and most of them are nearly doubled every two days. However, most ectopic pregnancies HCG values can only rise by 60% or even lower, while HCG values will generally be low compared to normal values, but there are also well-developed ectopic pregnancies where early blood HCG is the same as in a normal intrauterine pregnancy. For example, at 4-5 weeks of pregnancy, the normal HCG value can reach 3000 mIU/L, but in the case of ectopic pregnancy, most of them may only have 1000 mIU/L, and this is the time to suspect the possibility of your ectopic pregnancy. The presence of ectopic pregnancy cannot be determined from the HCG value alone, but can only be a preliminary speculation. When the embryo of an intrauterine pregnancy is underdeveloped or in the event of fetal abortion, the HCG value may increase slowly or even decrease. Some patients with atypical ectopic pregnancy need to repeat the blood HGG and ultrasound several times for further clarification.