The causes of bleeding in the 5th week of pregnancy include preeclampsia, ectopic pregnancy, etc. 1. Pre-eclampsia: the embryo in the uterus bed is not stable, a small amount of stripping may occur, the clinical manifestations of vaginal bleeding and abdominal pain, a small amount of bleeding can be applied to progesterone drugs to preserve the fetus, bleeding, it may be difficult to avoid abortion, there is no chance of preservation of the fetus. 2. Ectopic pregnancy: the fertilized egg in the uterine cavity outside the bed is called ectopic pregnancy, commonly known as ectopic pregnancy. Clinical manifestations are menopause, abdominal pain and vaginal bleeding, and even shock symptoms. Among them, tubal pregnancy is the most common, and ultrasonography can be diagnosed. When bleeding is found in early pregnancy should go to the hospital in time, under the guidance of the doctor’s treatment.