Slight vaginal bleeding after pregnancy is clinically common due to the following reasons: 1) Pre-eclampsia, which is caused by the abruption of the gestational sac and the uterine wall, often due to the lack of progesterone in the body or strenuous exercise, intercourse or history of trauma. 2) Local inflammation of the cervix, such as cervical polyps, may also lead to a small amount of vaginal bleeding. In this case, it is recommended to first do ultrasound examination to understand the current embryonic development, and at the same time to do laboratory tests of blood HCG and progesterone to understand whether these two indicators are normal, and then according to the results, clinical treatment will be given accordingly, if the above tests are normal, it is recommended to do gynecological examination to understand whether there are local abnormalities in the vagina and cervix and whether there are bleeding spots, and then according to the results of the examination, timely treatment will be given. Then, according to the results of the examination, timely treatment should be given.