Pregnancy with dark fluid area without bleeding is no matter need to see the development of the later stage of the disease, generally have dark fluid area often suggests that the first sign of miscarriage, and lead to the first sign of miscarriage of more causes, different causes lead to the symptoms are not exactly the same. Miscarriages are often characterized by vaginal bleeding and abdominal pain. Common causes of miscarriage include chromosomal abnormality of the embryo, luteal insufficiency or thyroid abnormality. 1. Embryo chromosome abnormality: When some embryos have chromosome abnormality, the embryo cannot survive, such as the appearance of dark fluid area, which may lead to bleeding or even miscarriage in the later stage. 2. Luteal insufficiency and thyroid insufficiency: these two conditions may lead to miscarriage. After timely supplementation of progesterone and thyroid hormone, the symptoms will improve, and the dark fluid area will decrease or even disappear completely, or the blood will be discharged vaginally, and most of the pregnancies can continue. If there is a dark liquid area in the uterine cavity, you need to pay close attention to your own special symptoms, and promptly consult a doctor for standardized treatment under the guidance of the doctor.