Don't think about it

As we're leaving the store with a grocery cart full of stuff and Nina is getting crabby, Audrey says, "Mom! I have to go potty NOW."

Me: Oh man, Audrey. I'll hurry home. We can't take this cart into the bathroom.
AT: Ok

In the car, she's physically "holding herself," and saying "Mom...hurry!"
Me: I am. Don't think about it, Auddie.
AT: What do you mean "don't think about it?"
Me: Just don't think about having to go potty. Think about something else.

2 min later, almost home.
AT: Mom, I'm not thinking about it. I promise.
Then turns to Nina and says, "I have to pee. I have to pee. I have to pee. Do you have to pee, too, Nina?"