Strange period this month?

I went to the doctor on Monday because I thought I had strep throat, but it turned out to be a viral infection. But anyways, I mostly stayed in bed until Friday. Didn't eat much during those days and then yesterday I noticed a brown discharge. Its very light. It carried into today, and now its a bit heavier. I usually don't get my period at this time of the month (I usually expect around next week?) Could this be my period? Is this my period or what is this? This has never happened before. Its really light and brownish colored. Usually my periods are really heavy and bright red colored. Help!