If a slow rise in HCG is abnormal after a biochemical pregnancy, two main possibilities are considered. First, the patient does not have a true biochemical pregnancy, but an ectopic pregnancy. In most cases of ectopic pregnancy, the gestational sac is not active, and the typical gestational sac appears late or persistently cannot be found in early pregnancy. If the patient also has a high amount of vaginal bleeding, it is easy to misdiagnose the pregnancy as a biochemical pregnancy. Patients must be continuously and dynamically monitored for changes in blood HCG and ultrasound and treated with methotrexate or mifepristone to kill the embryo if necessary. Secondly, considering that the patient’s intrauterine pregnancy is aborted incompletely and there is a small amount of residue in the uterine cavity, the patient needs to have an ultrasound to further observe the presence of abnormal tissue in the uterine cavity. If there are residues in the uterine cavity, the uterus needs to be cleared and sent for pathological examination in a timely manner.