Menstruation delayed nine days, there is always pain on the left side of the abdomen

Menstruation delays 9 days abdominal pain on the left may be caused by pregnancy caused by threatened abortion, should be admitted to the hospital for blood hcg examination, if not pregnant, may be due to pelvic inflammatory disease, irregular menstruation, endocrine disorders and annex inflammation and other diseases caused, should be admitted to the hospital for sex hormone six tests and uterine color Doppler examination.