Not sure of your location, but just an FYI, your eggs CAN get cold before you gather them. In nature (and in coops around the country), hens lay one egg a day until they have enough, THEN they sit on them and heat them. MANY people have good luck hatching eggs that have been sitting in fridges for several days. As long as your eggs don't completely freeze, you should be fine.
As an FYI, an egg has to reach an INTERNAL temperature of 28*F before ice crystals can form, THIS is going to be the magic number where you start to get "egg deaths" due to cold.