My iphone 5 randomly vibrates with no notifications. Could it be whatsapp?

So my iphone has been literally vibrating randomly throughout the day recently, with no new notifications or banners that I can see. Funnily enough, the random vibrations, to the best of my knowledge, didn't start until I downloaded whatsapp a week ago. Could the app have to do with it? What's happening?

Could the app have to do with it?
--- maybe. According to your story, then 100000000000% yes

What's happening?
--- you see here, i take dis sppoon, and i dip it in da puddin… And i go yummonomoummmmm

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