Can COVID19 testing cause further spreading?

Consider a scenario where you read that an employee at a store where you shop has tested positive for COVID19.

Do you continue shopping at that store or do you switch to another store?

Assuming you choose to switch, how many other customers read the same news and make the same choice?

Now what if you are carrying the virus and you begin exposing people at the new store you start shopping at?

Logically, people should continue shopping at the store where the infection was discovered until they themselves test negative, but how many people will wait for a negative test result before changing stores?

So if people change their regular shopping habits based on COVID19 test coming back positive from a store they shop at, they are more likely to change their shopping habits and thus spread the virus further, if they are carrying it.