I wouldn't worry too much. Your scent is all over the house for them. I am sure they will be sleeping in your bed while you are away. As long as they get their basic necessities and a little love a day they should be just fine. Maybe get them a couple new toys to play with while you are gone but in all honesty they would probably be more upset if you separated them from each other. They will definitely miss you but will be very excited on your return.