wait til sunday but i'd be more worried bout the cause of the regurge. its not a good sign. amke sure the temps are right as low temps can cause this. i'd also chuck away the batch of mice as they may be bad. temps are the most likely cause though. possibly a prey item thats too large but unlikely as snakes can realistically swallow items much bigger than the "width of the snakes body" which is often given as advice.
also. clean out the cage as i have heard of snakes sustaining scale damage from their own stomach acids