HCG on day 47 of pregnancy is equivalent to close to 7 weeks of pregnancy time, the normal value of HCG between 6-8 weeks of pregnancy is between 15000-200000 IU/L, so the range of this normal value spans a wide range, the specific value should be combined with the length of the usual menstrual cycle of pregnant women, the actual time of conception. The pattern of change of HCG in early pregnancy is that the secretion increases rapidly, doubles every 48 hours, and reaches a peak at 8-10 weeks, with a peak value generally in the range of 150,000-200,000 IU/L, which continues for 1-2 weeks and rapidly decreases to 10% of the peak value. Generally it is difficult to determine preterm miscarriage, or ectopic pregnancy by single HCG result, and it should be dynamically observed, closely followed, and diagnosed together with ultrasound and other auxiliary examinations. In early pregnancy, it is important to take rest, avoid sexual intercourse, and take folic acid and multivitamin tablets on a regular basis to prevent neural tube defects.