19 yr old virgin, my period is 17 days late. usually it's every 28-32 days. nothing stressful going on. should i be worried about it being this late?

No: Since you know that you're not pregnant, i wouldn't worry. Most women miss an occasional period. Sometimes it's due to stress, but can be from other things. If you go 2-3 months without a period, then you might want to see your doctor.

Causes?: Reasons for missed / late period include: an anovulatory cycle in which no egg is released, marked v or ^ in weight; eating disorder; over-exercising (endurance athletics), stress, travel, significant illnesses, oral contraceptives ; other meds, illegal drug use, breast feeding, hormone imbalances and medical problems (i.e., pcos). If go 3 cycles without a period see your gynecologist - or prior >.