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? Frozen rebif

I'm currently on holiday in Florida and am unsure if my Rebif has frozen. Fortunately, I've brought a thermometer and noticed that the temperature in the fridge had fallen to between 0-2 degrees. I've been adjusting the temperature of the fridge to keep it around 3-4 degrees. I'm sure that the bubble in the cartridge used to move. Now it's staying still. How will I know if it's frozen? Is it dangerous to use if it's frozen?