Normally, when the patient’s blood HCG grows to 4000mIU/mL, the presence of a gestational sac should be visible by ultrasound and it can be determined whether the pregnancy is intrauterine or ectopic. If the blood HCG is 4000mIU/mL but the presence of a gestational sac cannot be seen by color ultrasound, the possibility of ectopic pregnancy should be highly suspected, and the changes in blood progesterone, HCG and color ultrasound can be continued to be observed. If the blood HCG is HCG 4000mIU/mL, and the diagnosis of ectopic pregnancy cannot be confirmed by dynamic observation of the changes of HCG, progesterone and color ultrasound, along with vaginal bleeding with a relatively large amount of bleeding, signs of miscarriage should be considered. If it is miscarriage, the patient’s blood HCG shows a gradual decrease in the process of continuous monitoring, and as long as there is no obvious abdominal pain and pelvic bleeding, the observation can be continued again and No treatment will be performed.