My whatsapp data deleted itself on my iPhone?

I was using my iPhone 4 normally and was using whatsapp daily. Today in the evening when i opened my whatsapp it start saying restore from icloud. How? And all the data is deleted itself. Now i have a very pervious backup. Now how to bring all the data back of so many days. My chats and photos were there in it. My icloud backup was also turned off. IIm disappionted from this thing. How to recover all this. I need a big help.

You may have unmounted SD card!

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