My cycle is 2 days late and i'm having lower back and abdominal pain, urinating more, sinus problems, and nipple soreness. am i pms or pregnant?

Could be either: Could be either one. The only way to know if you are pregnant is to do a pregnancy test. It is normal for your me natural cycles to be a few days late at times. If it persists for a week or two then do a pregnancy test.

Do a HPT.: 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 (polycystic ovary syndrome or asherman’s syndrome). #1 reason is pregnancy.