Can I use boil and bite night guard as a temporary retainer? (photo)

I already went to the ortho and my new retainers should be coming in in a week or two and they are the wire retainers but I was also really worried about my top teeth and noticed a gradual shift in two days. So I went to my local Walgreens and bought a boil and bite night guard that I'm using. Will it work to keep my teeth from moving even a little bit until my real retainers get here?

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