['I got a promotion at work which was unexpected!', 'Well congratulations! What will you be doing at your new billet?', 'I will be managing a small team of software developers. It makes me a little nervous, but I think I can do it']
You managed to get a promotion, so you're obviously talented. I'm sure you will do just fine and earn many more promotions.
I got a promotion at work that was completely unexpected. It was actually a very nice day!