Hello. Cervical mucus isn't a great way to tell what is going on. I tried to conceive for a long time and that just wasn't accurate. Another way that is undeniable is to take your temp. You have to chart it over a couple of cycles but once you have that going, you will absolutely know if it was your period or not. Basically, your temp goes up noticeably around when you ovulate. It will stay up until right as your period is about to start and then it goes back down and stays down until you ovulate again. If the temp stays up and never dips back down again, that is indicative of pregnancy. Mine stayed up two times and both times I was pregnant. You can get a cheap thermometer and keep it by your bedside. You take the temp before you even get out of bed and write it down.
So, in this instance though. My guess is you are probably not pregnant. But wait a full week and then test again if your period hasn't come. (the normal period you usually have since you seemed to do more of spotting recently). PCOS makes things difficult with a woman's cycle. Do they do anything for the PCOS? Do you take metformin for example?
Period was also about 6 days early.