Menstruation can be delayed, but it is not good for health, if there is a special reason, you can take medication under the guidance of a doctor to delay menstruation, but the time should not be too long, because the time is too long, the endometrium overgrowth, come to menstruation, there will be a big bleeding affecting the health of the body. You can take contraceptive drugs to promote the growth of the uterine lining, it will not come to menstruation, after stopping the use of drugs, the uterine lining loses the hormone nutrition, it will be shedding bleeding, forming menstruation. Although you can artificially change the menstrual cycle, but it is not favorable to the endocrine, occasional use can be, if frequent use, easy to lead to menstrual disorders. If necessary you can use the drug under the guidance of a doctor.