If you have been hacked, you will see this message,
and there is a link to sign up for 1 yr free credit monitoring. In addition, you should place a fraud alert on your credit report. And Jill recommends freezing your credit report, which is a tedious process that must be done at each of the 3 credit monitoring agencies.
In addition, experts recommend you check your credit report annually, and links to do this, as well as freeze your credit file, are described in this web page below.