My period normally lasts seven days this month it started on the 20th and i stopped on the 22 it was not heavy its was brown and very light. ?

Unsure of cause.: The main reason for light periods is a change in hormone levels. Causes for what seems to be a light period can include: implantation bleeding in early pregnancy, thyroid problems, eating disorders, excessive exercise, initial periods for a girl, use of an intrauterine device, oral contraceptives & perimenopause. Brown discharge is usually old blood being cleaned from the uterus. Take care.