period talk

Jessica 😻
I have been on the pill since I was about 12 due to PCOS, with the pill I would have a period every two months. 
I came off the pill at the beginning of 2016 and would get irregular periods but would still get one every two months. 
I now haven't had a period since early September 2016. So it's been over 5 months now. 
I'm not pregnant, have taken a test at home and the Doctor, my doctor seems not to be worried but I can't help but think something's wrong. 
Has anyone had this happen before ?