Anyone take plan b after already ovulated?

So I had unprotected sec on cd14 which was the day I ovulated. This was confirmed by positive opk the morning before. So I am not guessing.

I took the plan b the morning of cd16. About 38 hrs after sex.

I have read on the website that plan b only works when taken in your fertile window and doesn’t work after you ovulate. Plan b stops you from ovulating so therefore if you’ve taken it when you ovulated or have already then it’s ineffective.

Anyone have advice or experience w this?