The normal value of HCG in 10 days of pregnancy is 50-500 U/L. HCG, human chorionic gonadotropin, is a commonly used clinical indicator to monitor the development of pregnancy. HCG begins to be produced when a normal fertilized egg is deposited, i.e., when the trophoblastic layer of the fertilized egg is formed on the 6th day after ovulation, and peripheral blood HCG can be detected about 1 day after the fertilized egg is deposited, and rises by a factor of 1 every 1.7-2 days, reaching 100 U/L on the 14th day after ovulation, and then peaks at the 8th to 10th week of gestation (15,000-200,000 U/L), and then declines rapidly thereafter. In the middle and late stages of pregnancy, HCG is only 10% of its peak. If the HCG value is low, it may be a sign that the development of the embryo does not correspond to the last menstrual period and it is necessary to recalculate the last menstrual period; it may also be a sign of poor development of the embryo, or even the occurrence of fetal arrest (induced abortion), which may lead to early miscarriage. If there is no exponential rise in the measurement at an interval of 2-3 days, ectopic pregnancy should be suspected. At this time, the patient should ensure sufficient rest, and the HCG value can be rechecked under the guidance of the doctor. If the HCG value is significantly higher than the normal value, it suggests that there may be abnormal pregnancy, such as hyperemesis gravidarum, and the pregnant woman should immediately go to the hospital, complete other examinations, such as gynecological ultrasound, etc., and carry out surgical treatments after confirming the diagnosis.