<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I havent had my period for 3 months now. I am concerned, could there be a problem?  <response>: Yes, there could be different causes of absent menstruation. As a first step, we need to do some medical tests to determine the cause. We will require a complete blood count, prothrombin time and APTT hematologic tests, a pelvic exam, a standard pregnancy test, urinalysis, examination of the breast, an ultrasound and a chlamydia test. 