Menstruation delays 3 days, occasionally abdomen can ache, what reason be excuse me

Menstruation delay 3 days, occasionally abdominal pain, may be emotional tension excited, irregular diet caused by, there may be mental stress caused by too much. Secondly, there may be suffering from some gynecological inflammation. In addition, can not exclude the possibility of pregnancy, you can go to the hospital to check the hcg value of blood, determine whether pregnant.