Decision Pending | Send a Reminder?
I think there is little reason to write. They haven't lost your paper behind a filing cabinet somewhere. They are likely busy, maybe due to the time of year or pending deadlines on publication of other issues. Having to respond will just add to their load. 

It is frustrating, I know, when you have a lot riding on a paper, but there is no need to panic. You can and should both relax a bit and also work a bit more on your research. 

Two weeks in the queue isn't very long, really. It may even be that a key person in the decision process is off on a late vacation.