Positive OTK during 6th day of period? (PCOS)

Ashley
Could I actually be ovulating on CD6 even though I'm still having dark brown/red discharge?
I usually don't get positive OTKs all but once every six months on CD17 & my period is usually only 5 days, but this period seems to still be going & yet positive OPK with clearblue digital?? 
My lh:fsh on CD10 last cycle was 8.8:7.1, so I don't think I'd get a false positive OTK so early?
Am I actually ovulating??