Slow growth of HCG, if it occurs in the early stage of embryonic development, with a well-developed gestational sac and germ, and just a simple slow growth of HCG, you can consider fertility preservation treatment, and it is possible to keep the pregnancy successfully. However, if the gestational sac is not well developed or if ectopic pregnancy occurs, fertility preservation is not recommended. In particular, patients with ectopic pregnancy will experience slow HCG growth due to the poor environment of the implantation location, while patients are mostly accompanied by mild or severe pain in the lower abdomen and a little vaginal bleeding, and need to terminate the pregnancy as soon as possible to avoid endangering the woman’s life. In addition, when the HCG reaches its peak at 8-10 weeks of pregnancy and decreases rapidly afterwards, obviously this is the time when it stops doubling and shows a slow growth. At this time, it is necessary to pay attention to the ultrasound results, and if the gestational sac and germ are well developed, there is usually no need for fetal preservation treatment.