Does a late menstrual period mean i am pregnant ?

Missed period: No, it does not mean you are pregnant, but you should check a home pregnancy test as most pregnancies are associated with being late for at least one period. There are other reasons beside pregnancy for being late. Doctors will want to check for pregancy first before looking at other reasons.

No HPT: 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.