The rate of HCG increase in the first 8 weeks of pregnancy is the fastest, and it usually increases at the rate of doubling every other day, and the slow doubling of HCG should be: 1. If the rate of HCG increase does not show the phenomenon of doubling every other day, but also reaches more than 70% of the growth rate, there is no big problem, and you can use appropriate drugs for fetal preservation treatment under the guidance of doctors. 2. If the growth rate of HCG is very slow, or even shows a progressive decline, it is mostly considered to be caused by embryonic dysplasia or even ectopic pregnancy, in which case further examination is needed. If there is no longer any value of fetal preservation treatment, the pregnancy should be terminated promptly. If an ectopic pregnancy is diagnosed after examination, timely treatment is also needed.