Irregular ovulation ?

I have PCOS and my ovulation is never regular. My periods are within normal range. I kind of gave up tracking my ovulation. My bf and I haven’t been using protection. I haven’t gotten my period this month but I spotted 1/18&1/19 very briefly. Super light and mixed with mucus only when I wiped a few times Then nothing since. Since I don’t know when I ovulate I can’t count DPO so I’m counting days since I last spotted. By googling I should test next Tuesday if I haven’t started. Has anyone had any similar experience? Did you get a BFP and if so how long after implantation bleeding/spotting?