If there is a fetal heartbeat and fetal bud on ultrasound, but there is bleeding, it is considered to be caused by too low progesterone, and there is a manifestation of preterm miscarriage. You should check the progesterone value in time and make sure the progesterone value is low, then take oral or intramuscular progesterone injection in time to replenish enough progesterone to avoid miscarriage, during this period, you should pay attention to recheck the HCG value, if the HCG value doubles well, it means there is no problem. If the HCG value doubles badly, it means that the secretion of human chorionic gonadotropin is too low, and intramuscular injection of human chorionic gonadotropin is needed to promote the development of the gestational sac, which is not well developed, although there is a fetal heart and fetal bud, but there is a possibility of shrinkage or fetal abortion at any time.