Please help as I am really worried

I recently downloaded a few adult movies (no sin) through the program. My shock was that some of the content was involving minors, this is not was I wanted to download at all. Luckily I was able to preview as it downloaded so I immediatly cancelled the file and trashed it. I am now seriously worried that the police are going to be knocking at my door. Please help/advise me. it has totally turned me of using the program as I never want anything like that to happen again.