So yeah it started doing this like a week ago. Everytime it starts up it vibrates for like 2 seconds then revs down. It sounds like VRROOOOMMMMM and makes it vibrate a bit. It also happens occasionally just from being on. What is this and should I worry about it? Laptop is about a month over being a year old

Could be that it just needs to be blown out or, your fans are going bad and the vibration is them trying to speed up too cool your laptop down.

It is the harddrive or the fan I would say.
Blow it out, and check your harddrive is secure.

EDIT: Actually its a laptop, so harddrive being lose is way less likely, so its probably just dust buildup.

Ok so I should just open it up and get a compressed can of air and blow the dust out?

ya