Pre cum

I apologize, this will not be pregnancy related but I just wanted to learn more about this. I know that pre cum MAY get you pregnant if the guy has not urinated since last ejaculation, but how likely is it to get pregnant from that certain circumstance? You guys may say it only takes one to get pregnant, but the reality of it is that it DOES NOT take only one to crack an egg. Sperms swarm the egg to crack it so that one sperm can fertilize it. For every sperm that make it, millions of them don't. Like I stated before, I know there is a chance but how likely is it? 🤔🤔