Is it possible to missmiss a period without having to be pregnant?

Yes: There are many reasons you could miss a period and not be pregnant, your gyn can detetermine the cause.

See your Gyn: As teen, can often be irregular due to growth / life / hormonal changes. Severe dieting / physical or emotional stress / extensive physical activity / bad infection / etc., can all cause missed periods. 3 months w/o should be discussed w/your gyn to be sure nothing going on that needs addressed. If might be pregnant, check hpt.

Yes: Missed/late period: low body wt, obesity, weight ^ or v, ^exercise, endurance athletics, breast-feeding, stress, illness, eating disorders (bulimia or anorexia), anovulatory cycle (no egg released), travel, perimenopause, just starting menstruation, hormone irregularities, drug use, meds (i.e., birth control) or medical problems (i.e., polycystic ovary syndrome). #1 reason is pregnancy.