The period is also known as menstruation, there will be no menstruation after pregnancy, vaginal bleeding after pregnancy should be considered to be other reasons, such as aura miscarriage, biochemical pregnancy, ectopic pregnancy, fetal arrest and so on. 1. Pre-eclampsia: After pregnancy, the hormone levels in the female body increase, the endometrium will not occur cyclic stripping, there will be no menstruation for the time being, vaginal bleeding after pregnancy is not menstruation, it may be pre-eclampsia, such as progesterone secretion of the body in the early stages of pregnancy is insufficient to support the pregnancy triggered by pre-eclampsia, there will be vaginal bleeding phenomenon. 2. Biochemical pregnancy: after intercourse, sperm and egg can meet to form a fertilized egg, which is not successfully deposited in the female body, and the hormone levels in the body will decrease and cause vaginal bleeding, which is similar to the usual menstruation. 3. Ectopic pregnancy: After pregnancy, the gestational sac does not normally settle in the uterine cavity, and settles in the fallopian tube, abdominal cavity, ovary and other locations for ectopic pregnancy, ectopic pregnancy site with the gradual increase in the size of the gestational sac, there will be rupture of the bleeding situation. 4. Fetal termination: Fetal termination caused by chromosomal abnormality, poor quality of embryo, maternal viral infection, environmental factors, the decline in the level of various hormones in the body will lead to the natural peeling off of the fetus, which will also trigger the symptoms of vaginal bleeding. There are more reasons for vaginal bleeding after pregnancy, and you have to go to the hospital and pass the examination to determine the specific ones.