7 day late period, egg white discharge, had one day of brownish pink discharge. took one hpt and it was negative. what could be going on?

Late 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 (i.e. PCOS). #1 reason is pregnancy.

Discharge: could be an infectious process, bacterial overgrowth or still possibly pregnant. See your physician for this.