Spotting after period. Because of pcos?

Hi, I have been diagnosed with PCOS a couple of months ago, the doc had given me multivitamin tablets, on taking on those tablets, in the month after (June)  I had normal-heavy ( my usual ) bleeding, I assumed it's regulating my period. I unfortunately had unprotected sex on the 28th of June, took an ipill and I got my period 7 days earlier this month, on the 8th of July. My flow usually lasts for 3-4 days, this time there was some light bleeding into the 5th day. However, I've noticed some spotting on alternative days thereafter. I'm not sure why this is occurring. Could it be the side effects of ipill? Or is it because of PCOS? I haven't experienced this before and it's causing me a bit stress. For additional context, I'm also working in a high pressure environment work wise and with family. Any information from you would be very much appreciated. Thank you.