Accidentally Scanned the Wrong Item at Walmart, Should I Be Worried? 🥺

So, I went to Walmart and ended up scanning a small lint roller twice by accident, meaning I paid less for one of the items. When I was done, I heard someone behind me say "sir," but I thought they were talking to someone else, and the receipt checker didn’t stop me at the exit. Now, I’m worried that I might have accidentally stolen something or that the store might come after me.

What are the odds that I could get in trouble or even arrested for this? It was definitely an honest mistake, but I'm still feeling anxious about it. Should I reach out to the store to explain, or am I overthinking this? How likely is it that anything will happen?

Thanks for any advice or reassurance!