The feeling of menstruation but not menstruation is considered to be caused by pregnancy, in the early stages of pregnancy is prone to breast swelling and pain, small stomach swelling, etc., is a normal phenomenon, do not worry. You can take a blood test to check the blood HCG to determine the pregnancy, determine the pregnancy, pay attention to rest can be, if there is no pregnancy, may be caused by endocrine disorders, and gynecological infections, such as pelvic inflammatory disease, vaginitis, etc., life stress, often stay up late and so on can be caused by, you can go to the hospital to take a blood test of sex hormones, gynecological examination, according to the specific circumstances of the reasonable treatment, if endocrine disorders caused by the hormone medication can be regulated. If endocrine imbalance is caused, you can use hormone drugs to regulate. Gynecological infections caused by the need for timely treatment with antibiotics, usually pay attention to rest, relaxation, do not give yourself too much pressure, if not pregnant, you can take progesterone under the guidance of the doctor to promote menstruation.