What is going on? TMI

Heyy I have a weird question, so I had my period a few weeks back and after I had sex and took a plan b the next day just in case. (This was last week sometime) so my discharge was a light pink and then it gradually just became this. I’ve been cramping pretty bad and during sex I had to stop because the lube that was being used hurt like crazy because it was mixed or I had some times of reaction to it. Now this blood is all brown but i just woke up to this after a nap. I have no idea what could be going on or if I should be worried? I also have pcos and don’t have periods often at all.

Thanks so much y’all 💛