After pregnancy, you should not have menstruation normally, that is to say, you should not have vaginal bleeding. If you confirm the signs of vaginal bleeding after pregnancy, you should first consider the following aspects. First, implantation bleeding of fertilized egg will cause small amount of vaginal bleeding, some people also have lower abdomen stomach pain and vaginal bleeding, must do ultrasound examination to exclude the situation of ectopic pregnancy. Secondly, because the progesterone in the body is relatively low, it can lead to signs of pre-eclampsia, and there will be a small amount of vaginal bleeding. Both of these cases are false menstruation. To identify the cause and the situation, you must go to the hospital for an ultrasound as well as a blood draw and see a clinician.