Weird period??

Peyton • Southern by the grace of God. ❤️
My period is extremely irregular, however this has never happened..... I had my period the first week of September (7 days). Then 4 days later, I had another period (5 days). And this month, I've had VERY VERY light spotting (no period), but only when I wipe. I'm not on birth control, so that can't be it. Do y'all know why this could be happening?