Unprotected sex and have not seen a period since the 5th of last month, pregnancy symptoms, negative clear blue test of a night time 1/2week ago?

Repeat the: pregnancy test a week after first one using a first morning void. 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).