My period is 28 days late and i have taken 2 home tests. they have come back negative. what should i do now?

See details: Speak with your gynecologist, especially if your periods have been regularly in the past.

Menses: 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. #1 reason is pregnancy. Seek gyn eval if no period w/i 3 cycles.