I have had 3 periods on due with pms, but i'm experiencing nausea with no vomit, fatigue, and breast pain (all these are minor symptoms) also, i'm vegetarian and anemic right now. could i still be pregnant, after all?

The only way to : know for sure is by taking a pregnancy test. Reasons for missed /late periods: low body weight, obesity, marked weight gain or loss, over-exercise such as in endurance athletes, breast-feeding, stress, illness, eating disorders (bulimia or anorexia), travel, hormone irregularities, drug use, medications (i.e., birth control) or med problem (polycystic ovary syndrome or Asherman’s syndrome.