After 10 days of delayed period but reveals zero on beta hcg, am i pregnant?

No: No, unless the bhcg is in error, you are not. You probably skipped or were late on last month's ovulation.

Not if you took HPT: at the 10 day point. 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. #1 reason is pregnancy.