Menstruation did not come very long, how to do

Normal female menstrual cycle in 21~35 days or so, menstrual cycle will be affected by a variety of factors, such as endocrine, environmental, emotional, drug, diet and other factors, menstruation for more than a week is not considered irregular menstruation or pregnancy caused, can buy early pregnancy test paper to detect whether they are pregnant, if not pregnant, can see a gynecologist blood test sex hormone levels, under the guidance of a doctor to use drugs to promote menstrual cramps.