Plan B effectiveness !!!

My boyfriend and I were having sex when we realized the condom had slipped off and was stuck inside of me ( i pulled it out but it was embarrassing 😥 ) he had already came in the condom before it slipped out and it took us a minute to realize it was off. The next day — about 14 hours later— I took a plan B. I know the effectiveness wears off the longer you wait but what’s the possibility of the Plan B not working in my case ??

the night the condom slipped off was the second to last day for my fertile window to end.

How high or low are my chances of actually getting pregnant from this ?