Hi, thanks for your question. I m glad to help. Delayed periods are not always due to an organic disease. If pregnancy is excluded, it may be a result of physical or emotional stress, hormonal imbalance, sudden weight gain, and sudden change in eating patterns. Being worried counts as emotional stress and may contribute to the delay. So it could be any of these. PCOD is a cause of delayed periods too, but would usually also present with other symptoms such as presence of facial and chest hairs, and it occurs in women who are obese. I would suggest you give it some time, if the delay recurs in subsequent periods, visit your gynecologist for evaluation of other organic causes. I hope i have answered your question. Best wishes.