Thirteen is feared in some cultures and cherished in others, which is why dream books read it as the number one step beyond a complete cycle. It stands for change, the unexpected and breaking with routine — not for luck of either kind.
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.