I just got a light period and i usually have heavy periods? just stressed. i'm also a week early. can early periods be light?

Possibly to all of: Those. The main reason for light periods is a change in hormone levels. Causes for what seems to be a light period can include: thyroid problems, eating disorders, excessive exercise, initial periods for a girl, use of an intrauterine device, oral contraceptives, perimenopause & implantation bleeding in early pregnancy (although this reportedly hardly ever occurs).