Biochemical pregnancy when the endometrium grows to a certain level, it will return the HCG to normal with a bleeding similar to the amount of menstruation, however, such bleeding is also considered as miscarriage, the bleeding may last for 7-10 days, as long as it does not exceed 10 days, it is normal. However, if it is more than 10 days, it is necessary to go to the hospital for an ultrasound examination to determine if there is any uneven shedding of the endometrium, and if it exists, it is necessary to take oral medication to help the endometrium shed clean to avoid prolonged bleeding. When the bleeding starts in biochemical pregnancy, it is recommended to take oral blood-stasis activating drugs to help the endometrium shed cleanly, and also to take certain oral anti-inflammatory drugs to prevent infection.