Whether or not a decrease in HCG at five weeks’ gestation is successful in preserving the pregnancy needs to be judged by the level of decrease in HCG. If the decrease in HCG is small and there is a tendency for a subsequent increase, there is some hope, but with a persistent decrease in HCG, there is little hope for fertility preservation. HCG decline is small, chorionic gonadotropin may increase exponentially due to the impact of the fertilized egg’s implantation, and with the prolongation of pregnancy, chorionic gonadotropin levels gradually increase, and timely medical attention is required to administer medication under the guidance of a doctor. Pregnant women also need to keep a calm mind, adjust the diet structure, try to eat a little more high protein food, pay attention to rest. If the level of chorionic gonadotropin continues to fall, you need to go to the hospital in time to improve the relevant examination to determine the activity of the fetus, if the baby loses its activity, it should be cleared in time. Regular checkups are needed during pregnancy, and the decline in HCG levels needs to be taken seriously enough for standardized treatment under the guidance of a doctor.