2days late cramping but no period took pregnancy test it was negative what could it be am i pregnant no stressing or any medical problems?

Time and technique: Home pregnancy tests should be done 4-5 days after the missed period. A negative result from a test done too early is not reliable. You may wish to repeat the test in 2-3 days; use first morning urine and follow the instructions for the test carefully. If you miss more than two periods without being pregnant, please consult your doctor.

Not certain: 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.