Menstruation delayed 13 days check not pregnant

Menstruation delay 13 days, but pregnancy test results negative, indicating that the patient's chances of pregnancy are very small. It is necessary to consider the cold palace, endocrine disorders and other conditions caused by menstrual delay, more common in polycystic ovary, pituitary tumor, premature ovarian failure patients. You can go to the hospital to do sex hormones, B ultrasound and other examinations, a clear diagnosis.