I was suppose to get my period on tue but instead i spotted with some blood clots now it's fri spotting has been diminishing day by day. neg preg test?

You could repeat HPT: in a week. 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.