Anyone??

I had an appointment with my endocrinologist today and mentioned to her that the last 2 months when I start my period I get a stabbing pain in my left ovary. this is the only 2 months it has happened so far and it will last for 2 or 3 days. She suggested it could be endometriosis and said I should get an ultrasound to determine. Has anyone been diagnosed with endometriosis after being diagnosed with PCOS? what were your symptoms?