PCOS problem?

I used to be pretty regular with my periods and they always came on the day that Glow would tell me. Well back in October I had a regular period but then in November I only spotted for two days (it was super light!) I tested a few times because I thought it was implantation bleeding. It was negative and my period never showed. Well in December, I didn't have a period at all. I didn't have spotting or anything. So I thought okay well maybe My period schedule is trying to mess up again. 
In January, I only spotted pretty light for two days. My period never came. Fast forward to this month. I was supposed to start today and I haven't yet. I don't have any pms symptoms at all like I usually do. I was diagnosed with PCOS a long time ago but I never went back to a specialist (so I'm not on any medication or birth control) has this happened to anyone else?? Also I've been nauseous and really moody. I'm going to take a test this weekend if my period doesn't show.