Maternity clothes are read as making room for something that is growing — a project, a relationship, a new part of life. The dream is usually about change and adjustment, not a literal sign.
Where in your waking life have you met something like this lately?
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.