Vicky, your liver lesions are very small and very common. 13mm liver lesions would be suspicious. You are receiving especially diligent care.
Even if the MRI gives unlikely worst bad news, you'll still be returning to normal life. Cancer care has advanced in recent years. You'd just receive treatment.
While it may be impossible to calm your nerves until you get those results, it doesn't advantage you to torture yourself. It can't change the outcome.
You might call the radiology lab to try and get in earlier on a cancellation.
Wishing you luck, but thinking you won't need it.