Mistakenly used wrong engine oil and worried!!

[Yaris2007Sedan]

I am kind of stupid because I fully relayed on Toyota dealership service parts sales person as I have changed my car's (Yaris 2007 S Sedan) engine oil for the first time by myself. That idiot sales person looked at the computer for engine oil type for Yaris 2007 and gave me W20 oil instead of W30. And I fully trusted him and didn't looked at the manual or cap until I used it. Later I realized that my Yaris specifically asked to use W30.

Now I am very worried if my engine will react differently or it would break down or something, as I read in some threads but in some thread it says it wouldn't matter much. Please advice what should I do?


Thanks!!