What in the world???

Shelly
Brown spotting Thursday...only once...AF started Friday...ended today (Sunday)...I'm super regular...I never have spotting b4 my cycles & they always last at least 5 days...not to mention that I only had dull cramps for a few hours as opposed to my normal debilitating cramps that require bed rest for a full day...confused but definitely going to the Dr...any ideas????