Being pregnant in a dream can stand for being "pregnant" with new ideas. Or thinking about a change in your life or wanting a change. A baby can represent anything new in life.
Unless you are thinking of, trying to, or worried about being pregnant, you should probably not take the dream literally. Dreams sometimes do warn us of physical conditions in advance, however, since you've been having this dream for so long, it couldn't be warning you that you were pregnant; you'd already know.
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