My breast are really sore my period is 8 days late i'm i pregnant or just having a late period?

Test: You might be. There is only one way to tell right now - get a pregnancy test. A home pregnancy test, available in many stores, can give you the answer. Follow the directions carefully.

Uncertain: 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 home pregnancy test to know.