New Macbook Pro makes "Bump" noise/feel when tilted

Hello, I recently bought a Early 2015 Macbook Pro Retina (with the new trackpad) about 4 weeks ago. Today I was in class using it, and had to tilt the device to show a teacher something and heard/felt a "bump" noise from inside of the machine. Is this supposed to be normal? I take extremely good care of all my electronics, and never let my macbook leave my lap/desk or my laptop bag.

I just barely got home from school to test this out, and it makes a subtle (or noticeable) "bump" feel/noise, like some in there is moving. The noise isn't loud at all, and I only really noticed it in complete silence, the noise/feel it makes sounds like something is a loose. What I'm mainly worried about is the fact that when I tilt it to a certain degree, I can feel a small/big bump depending on how I tilt it.

If you own a macbook pro, can any of you test out tilting your macbook sideways back and forth to see if you have can hear/feel it? I'm for sure feeling something moving. If none of you are experiencing the problem, should I exchange this to Best Buy, since I should have at least a 90 day warranty?

Once again, this device is like new, and I've only had it for about 4 weeks and never noticed it until now, it could have always been there, but I'm only now noticing it.