Condom Broke, Plan B & Ovulation Day

Alright ladies we had protected sex two days ago which happened to be during my fertile window with 13% chance of pregnancy according to this app, but GLOW shows it was my ovulation day and the condom broke. So I went to the store several hours later to get Plan B and they gave me the generic brand which I took immediately. However I’m reading a ton online that says plan b won’t work if you’re already ovulating. Any chance it could not be effective? I know with time I’ll either get a period or not and I’m aware it’s going to mess up my cycle but just curious what others have experienced.