It’s a good idea to keep an eye on your credit score periodically, especially if you’re rebuilding less-than-ideal credit. Some say you should check it every 6 months or so just to make sure there are no errors, too. And there are various services which will pull your score from the three major credit reporting bureaus for you, but you’re generally limited to once or twice a year.
Over at Credit Karma you can check your TransUnion credit score as often as daily, for free. Use code CKFRND to get started. (Be sure to use your designated junk email address, as they’re powered by advertising and partner relationships.) Looks like they use a “soft” pull of your score, too, which won’t impact your rating the way a “hard” credit inquiry will.