Plan b

So me and my boyfriend had unprotected sex on monday which was day 10 of my cycle. I got super paranoid and got plan b like the 27 hour after that so i know plan b should work better then but im still paranoid. Should i be okay ? This would be my 2 time taking plan b which was in march and last time i bled after 4 days taking it and this time i didnt so im a little worried that i didnt this time