How to Lost iPhone Contacts on iPhone after Jailbreak iOS 7?

I lost all the contacts of my iPhone 5! After I jailbreak my iPhone, and it cuase lost all important contacts. Is there any way help me to recover my contacts back from iPhone 5? It is very important for me. I think I have synced to iTunes before, but I can't found any contacts on iTunes, may friends said that the iTunes can backup iPhone data to iTunes automatically when we connect iPhone to iTunes. Is there any way to extract contacts from iTunes without my iPhone deivces?

If you have a backup from itunes you can restore that backup.