How long it usually takes to recover from subchorionic hemorrhage depends on the amount of bleeding; if the bleeding is low, it usually recovers on its own within a week; if the bleeding is high, the recovery time is slower and may take half a month to a month. If the bleeding damages the embryo, there is also a possibility of miscarriage. Subchorionic hemorrhage may be caused by chromosomal abnormality of the embryo, excessive overwork of the pregnant woman, strenuous exercise, insufficient function of the placenta or ovaries, and so on. If the bleeding is small, it can be absorbed by itself; if the bleeding is large, it needs to be treated with fertility preservation under the guidance of the doctor. And pay attention to review and observe the recovery of bleeding. During pregnancy, you should pay attention to rest, strengthen nutrition, pay attention to keep warm, avoid wind and cold, avoid contact with toxic and harmful substances to prevent damage to the embryo.