I had sex 2 weeks ago and i haven't had my period in 24 dys but i'm on bc am i pregnant?

One way to know. : Only way to be certain is to do a pregnancy test. They are sold pretty cheap in any drug store.

Don't know: 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. Take a home pregnancy test to know.