Plan B & Ovulation Day

Today is my ovulation day, according to my app. With a chance of 20.4% of conceiving (past two days were higher chances of yesterday being 33%).. However I’m trying to avoid pregnancy..

Yesterday had tons of ‘egg-white’ like cervical mucus.

Today we did the deed and I used Plan B after, usually we always avoid this time of the month but we didn’t today. 🙄

Question: if I’ve ovulated already, does it still possibly prevent the sperm from reaching the egg. I did read the package insert but it mainly talked about the delay of ovulation .. well what if I already ovulated?!

Help and decent feedback please.