Late period or possible pregnancy?

this is my situation, i have pcos but my af is regular 35 day cycle, so af was due 27th sept, i ovulated on 16, 17, 18th of sept bd each of these days,then 9 dpo thought i was getting af but just got some brown spotting that lasted like 1-2 days, startsd feeling v tired, bloated, dizzy, peeing like every 2 hours or so, cramping and slightly tingling , did hpt day after af was due got bfn, symptoms carried on now with sore s,tested 1 week later still got bfn, could you tell me what you think please.