should i take a plan b or is there no point

i ovulated on the 2nd and was no longer fertile on the 6th my boyfriend and i had unprotected sex on the 7th and i’m not sure if he pulled out, it’s currently the 9th, i read that plan b doesn’t work if you’ve already ovulated but i had ovulated days before the sex so should i take it or is it a waste of money at this point