If you have a delayed period after intercourse, you should first check if you are pregnant, or it may be due to endocrine disorders, as follows: 1. Pregnancy: If you are pregnant, you will usually have a delayed period. If the period is delayed for more than one day, if the pregnancy blood test reveals elevated blood HCG, it mostly indicates pregnancy, if the HCG is not elevated, it usually indicates that there is no pregnancy. The delayed menstruation can be temporarily observed, if the delay is within seven days, there is no need to worry, it is a normal range. 2, endocrine disorders: If the delayed menstruation exceeds seven days, it is usually an abnormal phenomenon, it may be an endocrine disorder. Women’s menstruation is easily affected by many factors, such as tiredness, staying up late, bad mood, anger, fright, cold, and geographical changes, etc. All the above reasons may cause early or delayed menstruation. Therefore, the first thing to do is to relax and change your bad lifestyle.