Hi guys, i accidentally deleted my whatsapp and lost all messages and pictures. Do u guys know if there is any way to retrieve them back?

Will re-sync on iTunes work? I'll be transfering the whatsapp application only instead of a full back up or restore (since the last time i back up was a week ago).

Or do u guys have any other solutions? I did some Google and only found out that Android devices can restore back their messages thanks to the auto back up function that save their messages in the memory card.