bump vibrating?!?

Kayla
Okay so I'm 27 weeks +2 Days.. I've been feeling kicks and bumps from our little man along with this "rolling" feeling... but today while relaxing I've felt this "shaking" feeling..like a vibration low in my bump. Followed by some pressure on my left side...
Anyone know what this feeling is? Should I call my OB? 
Having a first time pregnant lady freak out worry session... lol 

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