I always had regular cycle, even with pcos my periods were always regular. Sometimes due to stres or traveling 3-5 before or after it would fluctuate. This time it's almost 10days and i haven't got my period. I started dieting and gym 4 weeks back to lose weight,(iam going to gym from almost 6months, now i have reduced to 3-4days in gym for 45mins approx from 5days of 45-60mins each) i lost 1.5-2kgs. For my pcos i take metformin (500*2) and multivitamin daily. I also took pregnancy test and it came out negative. My period was supposed to come on 28th or 29th Nov, and upon checking i ovulated on 2nd Dec. Iam worried of my missed period. What can be the reason?