A: This is possible as delay of periods as there are various factors due to which periods get delayed.
Before discussing the factors I want to make one point very clear that it is normal medical condition for a female having two irregular periods every year. That means not every periodic cycle can be perfect.
Stress also causes late periods in women. Stress can be of any type such as emotional stress due to studies or tension in relationship and depression of any kind. In female athletes, physical stress is responsible for delayed period. Illness, tiredness due to lack of sleep, sexually transmitted disease, rapid variation in body weight and high intensity exercises are also responsible for late period in women.

Imbalance in hormones causes delayed period in women and especially in teenagers. It also leads to irregular periods due to which there is growth in body hair and sudden increase in weight. There are also few incidents in which stopping the consumption of birth contraceptive pills causes hormone imbalance which leads to delay of menstrual cycle or periods. Such contraceptive pills are not hundred percent safe and some other contraceptive measures must be used to prevent situation of pregnancy. If you have missed more than two periods without any specific reason then your gynaecology doctor can inspect your ovaries to discover symptoms of hormone imbalance. Blood tests are also done to find out hormone levels. Situation of hormone imbalance can be easily treated in medical science. Complications of thyroid and pituitary gland, adrenal glands and ovaries are also responsible for late periods. But these factors are rarely responsible for a delayed period.
So the next time if you have late periods then don’t worry, possibly it is not due to pregnancy.