If your period is delayed and you experience lethargy, you must first rule out the possibility of pregnancy. You can use early pregnancy test paper to test, you can also go to the hospital to draw blood to test blood HCG, mainly to rule out the possibility of pregnancy. Most women who are pregnant may experience fatigue and drowsiness. If the possibility of pregnancy is ruled out, it is caused by endocrine disorders, it is recommended that this situation timely use of drugs to promote menstruation. Commonly used drugs is progesterone, 1 day to take 1 time, 1 time to take 2 capsules, take 3 consecutive days, 3-7 days after stopping the drug will come to menstruation. As progesterone can cause dizziness after an hour or so, it is best to take it orally before going to bed, so as to avoid dizziness.