Period Issues on the Pill

Hi everyone,

I’ve been taking blisovi fe 1/20 dosage for a couple years now, I’ve never missed a pill and have only taken it a few hours late or early a couple times. I got my usual withdrawal period on December 26-29 which is the normal time it lasts. However starting Jan 1 I started taking vitamins and working out (usually walking for a couple miles) everyday. January 7th to about Jan 13th I got another full blown period, like spotting at first but then red blood clots and a heavy period. This is two weeks before my next withdrawal period is supposed to happen. Since then I’ve been on an off spotting a good amount and now today January 18th I’m passing small blood clots again. Should I be worried?? Could I be pregnant?? Please help!!