Fluid dark area in the uterus at six weeks of pregnancy may be related to stale bleeding, but it is also important to pay attention to whether it is a miscarriage or other diseases. Fluid dark area in the uterus at six weeks’ gestation is first ruled out as preeclampsia, requiring hospitalization for fertility preservation treatment, bed rest, light diet, regular work and rest, and regular monitoring of HCG levels and primitive cardiac tube pulsation. If it develops into inevitable miscarriage, the uterus should be cleared in time to avoid infection or coagulation dysfunction. The liquid dark area of the uterus in the sixth week of pregnancy may also be stale bleeding. Early pregnancy, due to large fluctuations in hormone levels, may lead to a small amount of shedding of the uterine lining, which is manifested as a small amount of brown stale blood. This type of condition is mostly not accompanied by abdominal pain, hardness of the abdomen and a feeling of falling, and generally does not require treatment. However, if the bleeding increases, accompanied by lower abdominal pain and a sensation of falling, miscarriage should be considered. In clinical practice, we recommend pregnant women to have regular checkups, to be alert for pre-miscarriage, and to seek prompt medical treatment if there is any discomfort.