I haven't started my time of year this month and i don't know why?
Answers: its always normal to own late peroids. it might also stop because of stress. .
Having irregular or missed periods can be cause by a number of things such as significant weight gain or loss (Although low body mass is a common cause of missed or irregular period, obesity also can cause menstrual problems), over-exercise, poor nutrition (or a diet too soaring in carbohydrates), smoking, certain medication, caffeine, excessive alcohol use (interfering with how the liver metabolizes estrogen and progesterone), eating disorders, increased stress, PCOS (Polycystic ovarian syndrome or estrogen dominance), uterine abnormality such as fibroids, ovarian cysts, polyps, endometriosis and hormonal imbalances.
I would recommend you consult with your doctor/gynaecologist for further evaluation to see what they believe could be causing this.
Good luck :).
it is normal for it to be in arrears, relax, don't get stressed out.