TMI PIC ** Implantation Bleeding or AF?

I get irregular periods due to my pcos and after having my period for almost 3 or so months I havent seen AF for nearly 3 weeks. (I usually get my period every 2-3 months). I woke up this morning and went to the toilet and seen this brownish discharge/period?leading up to this I did a hpt a few days ago and was a very faint line and was waiting to test again next week,I have had period like cramps sore boobs (which I never get) and hot flushes! Do you think this is the start of my period or possible implantation bleeding?