If the pregnancy is normal, in the early stages of pregnancy, it usually does not lead to bleeding. If bleeding occurs in early pregnancy, there are several possibilities: first, pre-eclampsia miscarriage, the occurrence of pre-eclampsia miscarriage is related to the poor quality of the embryo, poor rest of the pregnant woman, strenuous exercise, and mood swings and so on. In addition, there are also some endocrine factors that can affect. Secondly, the placenta factor should be considered. In early pregnancy, if the position of the placenta is low and the placenta reaches or is close to the endocervix, it will also increase the risk of bleeding. Third, there are a few gynecological diseases that can also cause bleeding, like cervical polyps, and inflammatory vaginal inflammation, etc. Fourth, there are a few pregnant women who experience a little bleeding when the embryo is in the womb. In any case, if bleeding occurs, it is necessary to improve the relevant examination.