Custom text on login page after new registration

I want to put custom text on the login page immediately after a new registration so that I can say to check your spam folder and tell the user what email address the validation email is coming from. Is there a way to add this to the DBD Login Style easily? I know I can put text on the login page, but I only want to show different text when I’m at “wp-login.php?checkemail=registered”.