The future of menstruation, that is, the absence of menstruation, may be pregnancy or menstrual irregularities. If you have sex with a woman, it is possible that she is pregnant if her period is suspended after intercourse, but it is not absolute. It is normal for the period to be delayed for seven days, and if she is not pregnant after seven days, she should be considered to have an irregular menstrual cycle. Can not be based purely on menstruation to determine whether a woman is pregnant or not, you can go to the hospital ten days after having intercourse to draw blood to check HCG (human chorionic gonadotropin) pregnancy test, you can also have fourteen days after having intercourse to determine whether there is a pregnancy through the urine pregnancy test, the initial determination of pregnancy after six to eight weeks of menopause to go to the hospital to do ultrasound to be able to confirm the diagnosis. There are many reasons why menstruation doesn’t come, such as stress, prolonged late nights, malnutrition, polycystic ovary syndrome and other diseases, which may also cause delayed menstruation or amenorrhea. If your period is not coming for a long time, you need to consult a doctor to find out the cause of the problem.