Im having period like cramps and im five days late on my period i took a pregnancy test and it was negative what i do thank you?

Perhaps your period: will start late. Consider repeating pregnancy test in a week if still no period. 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.