I have been really stressed lately and my period was supposed to come a week ago. i haven't got it yet, i have irregular periods, am i pregnant?

Hard to guess: Some causes of a late period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (like birth control pills), hormonal imbalances, etc… Pregnancy is a common cause of a missed period, if having sex. Urine pregnancy tests are very accurate. Seeing a doctor is a good idea if symptoms are persistent, recurring, or worrisome.