The day after menstruation is actually pregnant, this situation is relatively rare in the clinic, indicating that the previous menstruation should not be a normal menstruation, may be the “radical menstruation” is often said to be the fertilized egg bed bleeding, generally the bleeding volume is relatively small, the time is also relatively short. This is because after pregnancy, the corpus luteum will continue to develop and maintain the endometrial growth without shedding and bleeding to form menstruation, which is the reason why menstruation does not occur after pregnancy. If the bleeding is similar to the usual menstrual flow, it is considered to be an inevitable miscarriage. In either case, you should see your doctor for an ultrasound.