A small amount of bleeding in the first trimester of pregnancy may be related to miscarriage, cervical disease, external forces, etc., and needs to be analyzed specifically. 1. Pre-eclampsia: Pre-eclampsia may be triggered by poor embryonic development or chromosomal abnormalities, etc. The typical symptom of pre-eclampsia is a small amount of vaginal bleeding. 2. Cervical disease: pregnancy combined with cervical disease, such as cervical polyps, cervical intraepithelial lesions, etc., there may also be a small amount of vaginal bleeding. 3. External forces: lifting heavy objects, impact on the abdomen, etc. may lead to partial detachment of the placenta from the uterine wall and a small amount of bleeding. There may be other reasons for small amount of bleeding in the first trimester of pregnancy, and it is recommended to go to the hospital for examination. Bleeding during pregnancy must be paid special attention to and cannot be ignored. Once bleeding is detected, immediately go to the hospital for examination to clarify the cause and then treat the symptoms. The first trimester of pregnancy should pay attention to avoiding exertion and prohibiting sexual intercourse.