plan b

my cycles are usually 28-30 days and i had sex august 8th (day 3 of period) and plan b the 9th (day 4 of period). how long will plan b delay ovulation? right now i have wet and slippery discharge, similar to egg whites. i think i’m ovulating rn, so does that mean plan b didn’t work? or did i take plan b at a point in time where it wouldn’t have even delayed ovulation becuase i don’t ovulate until around day 14 of my cycle?