Please Answer 😫

I haven't had a period since November 3, according to glow im due for my period march 3. I was wondering if my irregular periods could be caused due to weight gain, sedentary life style, and stress? I've brought up the missed periods to my doctor many times and all she says is "pcos, you have pcos" but she hasnt ran any test. I finally got an appointment for a pelvic exam and cyst examination on the 28th, but just wanted to see what you guys think? Has anyone gone through this? What should I expect at my exam?