Two days late period negative pregnancy test why is that?

Anovulation: is a possibility. Are you on birth control? Women can miss periods on birth control. If it continues consult your GYN.

"late" period: Two days is not uncommon, and a negative pregnancy test is not always reliable if it is a urine test. Sometimes ovulation is delayed (stress, etc) and menstruation after ovulation occurs almost always 14 days later. If no period occurs in the next 4-5 days, obtain a serum test for pregnancy (not urine). If negative, your period is just delayed. See your healthcare professional if this persists.

Normal variant: A regular period could occur every 21 to 35 days. Periods rarely start on the same exact day every month. Sometimes they could be a few days off and still be normal. Sometimes stress may alter our periods slightly. To better help with these issues, I hope that you visit an OBGYN

Many reasons??: 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.