If vaginal bleeding occurs in the first month of pregnancy, it is definitely an abnormal phenomenon, clinically it is the possibility of pre-eclampsia or embryo stops developing or ectopic pregnancy. It is recommended that in addition to ultrasound to determine the location of the gestational sac, blood should also be drawn to check the blood HCG and progesterone, and blood should be drawn again every other day to find out whether the blood HCG has doubled or not. If there is no doubling of HCG and no gestational sac can be seen in the uterus, then ectopic pregnancy is highly suspected and this case must be hospitalized for observation. If the blood HCG does not double well when the gestational sac is already visible in the uterus, it is most likely due to poor embryonic development. It is recommended to be hospitalized for observation and to take a blood test for HCG and decide whether to continue the pregnancy or terminate it according to the result.