Problem syncing contacts from old phone to new phone

I am upgrading from Iphone 4 to Iphone 5. Successfully transfered apps, music using ITunes, but contacts didn't transfer. When I went back and tried again, (re-syncing contacts from old phone), I only got my husbands contacts, he syncs his Iphone4 to the same IMac. We have the latest version of Itunes (just upgraded to Mountain Lion). How can I get my old contacts instead of his?

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