If menstruation is delayed for three days from the original basis, it is normal, and if it is delayed for half a month it is not normal. Menstruation is a normal physiological phenomenon of women, physiological phenomenon is regularity, and the amount of menstruation, the color of menstruation will not change accordingly, is normal menstruation. If the menstrual cycle is delayed for half a month, have normal sex, clinically to exclude the possibility of pregnancy, if there is no pregnancy, the vast majority of delayed menstruation due to endocrine disorders, it is recommended that oral progesterone to promote menstruation, eat once a day, eat two pills a day, take three days in a row, after stopping the drug will come to menstruation in three to seven days, if you stop taking the drug on the eighth day, the ninth day did not have menstruation, it is recommended to go to the hospital for examination to rule out premature ovarian function. If you don’t have your period by the eighth or ninth day after you stop taking the pills, it is recommended that you go to the hospital for an examination to rule out the possibility of premature ovarian failure.