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Blood coagulation factors play an essential role in pregnancy. We describe a 30-year-old pregnant woman whose course was complicated by dysfibrinogenemia with polymorphism of fibrinogen AαThr312Ala (rs6050) GG genotype. She was admitted to our hospital for genital bleeding and a huge subchorionic hematoma at 6 gestational weeks. Her first pregnancy and delivery had been uneventful, whereas her second and third pregnancies had resulted in spontaneous abortions with massive subchorionic hematomas. Her fibrinogen activity level was 125 mg/dl and this was lower than her fibrinogen antigen level. We administered tranexamic acid early in the pregnancy, and the subchorionic hematoma diminished in size in accordance with the increase of her fibrinogen level. At 16 gestational weeks, her D-dimer levels were elevated, and heparin treatment was initiated as an alternative. A male infant was delivered at 36 gestational weeks. Intrapartum hemorrhage was 600 g. Patients with coagulation abnormalities are often asymptomatic in the absence of pregnancy. However, when they become pregnant, the spontaneous abortion rate is high. Careful observation and effective management of coagulation abnormalities are essential for such patients to carry their pregnancies to term.