OK, I won't freak you out cause mine isn't a feel good story! LOL!

But I think at 3cm, it's more than likely to be what they call a 'functioning' cyst which very basically means no big deal and should just go away on it's own.

Good luck!

**ETA: PAHLEASE do not start googling if you don't want to freak yourself out. Just wait till you see your specialist.