If a pregnant woman has a small amount of brown discharge at five weeks of pregnancy, it is considered to be caused by pre-eclampsia miscarriage. There are many reasons for preterm miscarriage, such as low progesterone, poor rest, poor physical condition, and embryonic dysplasia. In addition, if no gestational sac is seen on ultrasound at about five weeks of pregnancy, and if the progesterone is particularly low and the HCG is doubled, it is necessary to exclude ectopic pregnancy, which occurs mostly due to inflammation of the fallopian tubes. For this kind of bleeding, first of all, blood should be drawn for ultrasound to find out the cause, and at the same time, attention should be paid to rest and, if necessary, hospitalization.