Should i be worried that my period comes later every month?

Are you counting out: Length of menstrual cycle by days or just expecting it to be on the same date every month? The later would be inaccurate. Reasons for missed/late periods: low body weight, obesity, marked weight ^ or v, over-exercise, endurance athletics, breast-feeding, ^ stress, illness, eating disorders (bulimia or anorexia), anovulatory cycle, travel, hormone irregularities, drug use, meds or med conditions.