When your period has been delayed for 12 days, the first thing to do is to take a urine test to rule out pregnancy. This method is very simple, you can go to the drugstore to buy your own urine test paper, with the first urine discharged in the early morning to test. If the test paper indicates two red lines, it means that you are indeed pregnant. If there is only one red line, it means that you are not pregnant at the moment, and it is best to take a new test after a few days’ interval. If your period is delayed for a month and you still don’t have your period, you should go to the hospital to rule out other endocrine diseases. The most common reasons for delayed menstruation, besides pregnancy, include mood swings, late nights, work stress, and taking emergency contraceptive pills.