I'm 22 years old. I'm around 5'6 and weigh 52 kgs. I usually get my periods pretty regularly. ( 29-31 days every month) but I joined the gym this month and my due date was over 3 days ago and i still haven't got my period.  It's the 34th day today.  I go to the gym around 4 days a week and workout at home for the rest of the days. I used to have irregular periods back when I didn't do any exercise and lived a lazy lifestyle, but I've been having pretty regular periods for 1.5 years since then. I'm worried, pls help? I'm not sexually active at all so there's no chance of pregnancy.