My period is due today and it came on but it's just lighter than a normal period. i had mild cramping but not like my regular period cramping. prego?

Hormonal: Sounds like a hormonal glitch but also consider pregnancy if that's a possibility.

Light period: 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.