There are a few ways to tell if you've actually won a sweepstakes. One is to look for an email from the company or organization that ran the contest. If you're announced as the winner, they will likely include instructions on how to collect your prize. Another way to tell is to check the company's website or social media page. They may have a list of winners that they'll update periodically. Finally, you can contact the company directly and ask if you've won.