If you have one menstrual period in a month, and there is vaginal bleeding in one of the periods, the second vaginal bleeding is not menstrual, but abnormal bleeding, which is caused by some kind of diseases, such as endocrine disorders, pelvic tumors and so on, which may lead to irregular vaginal bleeding, and the next time you have another period is one month from the day of your normal menstruation, and then you will have another period, which is a normal situation. It is recommended to go to the hospital for examination, because it is not possible to have vaginal bleeding twice a month under normal circumstances. It is recommended to examine and understand the causes of abnormal bleeding, and then give appropriate treatment. Menstruation is a normal physiological phenomenon, which means that the menstrual cycle is regular, the amount of menstruation is the same as in the past, and the color and time of menstruation are the same as in the past.