Random spotting

So every once in a while I’ll spot a little within the week before my period but currently I’m about 20 days in (my cycles are pretty irregular, I have PCOS, usually 35-75 days though) and I’ve spotted twice already. Guarantee I’m not pregnant or anything like that, and I’ve never had this problem before.

Yes I will call the doctor when I get a chance but I’m a booked SOLID during work hours for the next few days so in the meantime, any clue why this might be?

Thanks!