Hi Jennie,
yes I do have PCOS, but my period has never done this before. I notice the change since i started having sex with my fiancee a year ago. He is way bigger than my ex hubby and i remember the first time i had sex with him, the next day i got my period. it wasnt due til 2 wks later. and he was out of town for a month, came back and we had sex 2 days in a row and got my period 2 wks early again. weird! never happened with my ex.
You could have PCOS but it takes more than an irregular period to have it. I would bring it up with your doctor and talk to them about checking you to see i you have the condition. You may just have an irregular cycle. Also, thyroid issues can cause your cycles to be off sync as well.