Your dream narrative is not specific. Where did the coin fall out? As far as I know, it's summer, and your trouser pockets are very shallow. You usually like to put change in your pocket (without your wallet). I often worry about taking it out when I dig or make big moves. In a shallow consciousness, you will also worry that money or something important will slip out when you go to the toilet.
Don't be superstitious about Duke Zhou, it's useless.