In the early stages of pregnancy, if the amount of black blood is not too much, it is not considered dangerous and you can go to the hospital for a gynecological ultrasound to see how the embryo is developing. If everything is normal in the ultrasound and black blood appears, if you plan to have a baby, you should also give appropriate medication to preserve the fetus. If black blood is flowing in the early stages of pregnancy and the amount is very high and there is abdominal pain at the same time, this situation may be inevitable miscarriage or ectopic pregnancy is considered and you should also go to the hospital first for a gynecological ultrasound to see the condition of the embryo. If the ultrasound reveals a gestational sac in the uterine cavity with very heavy bleeding and abdominal pain, you should be hospitalized; if the bleeding is more than twice the usual amount of menstruation, you should consider timely removal of the uterus to stop the bleeding. If the ultrasound is done and the ultrasound suggests an ectopic pregnancy, you should be hospitalized even more and surgery should be used to remove the ectopic pregnancy lesion if necessary.