In the first month of pregnancy, the presence of bleeding is abnormal and requires attention to the risk of spontaneous abortion, which requires continuous monitoring of chorionic gonadotropin and the occurrence of spontaneous abortion if there is a drop. If chorionic gonadotropin does not double in 48 hours and there is vaginal bleeding, it is important to be alert for the occurrence of ectopic pregnancy. It can be observed continuously. If the gestational sac is not visible at the time of the ultrasound after 35 days, it is possible that the pregnancy is ectopic and requires hospitalization. If the chorionic gonadotropin doubles very well, the bleeding may be a preterm miscarriage, in which case treatment is needed to preserve the pregnancy.