So my period is usually always on time and lasts about 3-4 days. About 4 months ago I skipped a period altogether, the only time I had ever done that was when I was pregnant, but when I got it the next month I figured no biggie. This month though I got it a week early and its lasted about 8 days now. It's been really light for the last 4 but it's still there. Any advice?