A small amount of bleeding in early pregnancy may be caused by a prior miscarriage, ectopic pregnancy, hyperemesis gravidarum and other diseases, or cervicitis and other diseases. 1. Pre-eclampsia: Pre-eclampsia is mostly caused by various factors such as embryo and environment, and the typical symptoms of patients are small amount of vaginal bleeding, lower abdominal pain that cannot be relieved, and so on, and so the patients will have the symptom of small amount of bleeding in the early stage of pregnancy. 2. Ectopic pregnancy: Ectopic pregnancy is caused by tubal disease, contraceptive failure and other factors, the main symptoms of patients are abdominal pain, vaginal bleeding. As a result, the patient will have a small amount of bleeding in the early stage of pregnancy. 3. Grape fetus: Grape fetus is formed due to the development of abnormal fertilized egg, patients will have abnormal vaginal bleeding after menopause, abnormal enlargement of the uterus, abdominal pain, vomiting in pregnancy and other symptoms, so the patients will have a small amount of bleeding in early pregnancy. 4. Other: other diseases such as cervicitis, cervical polyps, uterine fibroids and so on can also lead to the phenomenon of small amount of bleeding in early pregnancy. During pregnancy, patients should follow the doctor’s instructions to take obstetric examination on time, and if there is any discomfort, it is recommended to go to the hospital in time, to clarify the cause of the disease and follow the doctor’s instructions to deal with the treatment.