If only a little blood comes out when the period comes and then it is gone, clinically it may be caused by the following reasons: 1. caused by pregnancy, individual women after pregnancy should have a period when a small amount of vaginal bleeding, in fact, clinically this is not a period, but abnormal bleeding, it is recommended that blood can be drawn to check the blood HCG, you can understand whether it is pregnancy, and then further examination. 2, Drinking a lot of frozen drinks when you have your period will make your period appear clean suddenly. It is suggested that you can drink hot brown sugar and ginger water at this time, which has the effect of dispelling cold and warming the uterus, and is expected to make your period come again normally. This is the main clinical reason for the absence of menstruation after a little blood, and it is recommended to give the appropriate treatment after passing the examination.