What do athletes do if they have to pee right before or during the big moment?

Ex. Do fighters leave the ring and come back? Does a soccer player just “hold it for 45 min? Football players leave the play?

Since they’re “professional” athletes, I’m assuming that they know by now to go before the game, but sometimes you just need to go. If they hold it, wouldn’t they piss themselves if they get hit really hard in a play? (tackle, punch…)