A checkup is read as a routine look at how things stand. Dream books take it as the wish to make sure all is well — a kind of inner inventory rather than a sign of trouble.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.