I usually suffer from delayed periods. And this time my periods has been delayed by 45 days. And I had unprotected sexual intercourse after 45 days count. I still haven't got my menstruation. So I visited a doctor and she gave me nostra tablets for 5 days for getting my periods. It's been a week of my sexual intercourse and have taken 5 days nostra tablets. I still haven't got my periods. Rather I feel unwell and nauseated. I do not want to take pregnancy. What could be the cause of my ill health?