The vague pain in the abdomen with a small amount of blood in the early stage of pregnancy may be caused by the implantation of the fertilized egg, pre-miscarriage, ectopic pregnancy and other reasons. 1. Fertilized egg implantation: In the early stages of pregnancy, as the fertilized egg has just implanted, it stimulates the inner wall of the uterus, which may lead to a small amount of bleeding caused by the shedding of the uterine lining, which will be accompanied by a vague pain in the stomach when it is peeled off. 2. Pre-eclampsia: Pre-eclampsia refers to a small amount of vaginal bleeding before the 28th week of pregnancy, followed by paroxysmal lower abdominal pain, back pain and other symptoms. 3. Ectopic pregnancy: Ectopic pregnancy, also known as ectopic pregnancy, refers to the fertilized egg in the uterus outside the body cavity of the bed, the main clinical manifestations of menopause, abdominal pain, vaginal bleeding, etc., in the early stages of pregnancy, vague pain in the abdomen with a small amount of blood may be caused by ectopic pregnancy. It is recommended that the patient consult a doctor in time, clear the cause of the targeted treatment, pay attention to rest in life, maintain good hygiene habits, pay attention to keep the vulva clean.