I had my last period on january 15th and now i am 2 days late. i have never experience late period before. it is usually on time or early. why?

See a doctor: There are so many factors including and excluding pregnancy that can effect a cycle. A history, physical exam, and laboratory testing can help clear things up. Sometimes stress, excessive exercise, low body fat, hormonal disturbances........Can effect your period. 2 days late is not unusual...See what happens.

Take pregnancy test.: 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 (no egg released), travel, hormone irregularities, drug use, meds (i.e., birth control) or medical problems (i.e. PCOS). #1 reason is pregnancy.