Seems very small. Sounds like whatever it is was found early.
Only 1 nodule?
It could be anything. And it could be benign. Do what you need to do. It really doesn't help to worry and lose sleep. Believe me.
On my 3rd chemo treatment at Mayo in Jax. I sleep like a baby. Keep your mind occupied with things other than reading about lung cancer.
Resolve yourself to fight like hell if it turn out to be what you're afraid of.
I learned long ago that your attitude helps as much as anything.