A little bit of bleeding in early pregnancy may be caused by embryo implantation, preeclampsia, ectopic pregnancy and other factors. 1. Embryo implantation: pregnant women in the early stages of pregnancy, when the embryo implantation may lead to large hormonal changes in the body, some pregnant women may appear vaginal bleeding, if not accompanied by other physical symptoms, no need to worry too much, is a normal phenomenon. 2. Pre-eclampsia: Its causes are related to infection, uterine deformity, strong stimulation, bad habits, low immunity and other factors. Patients may have vaginal bleeding, lower abdominal pain, secretions of dark red or bloody leukorrhea, there may be no pregnancy discharge, followed by paroxysmal lower abdominal pain, lower back pain. 3. Ectopic pregnancy: the etiology of ectopic pregnancy is related to tubal dysplasia, tubal inflammation and infection, smoking, endocrine abnormalities and other factors. Patients can have abdominal pain, vaginal bleeding, menopause and so on. There are many clinical causes of bleeding in early pregnancy, and it is recommended that patients identify the causes of the disease in a timely manner and give targeted treatment under the guidance of the doctor.