Ducklings First quacking

[Ducktown]

Is this her first quack? It's 15 days old duckling and I'm hoping it's a girl.
I first noticed her quacking yesterday. She seems to do this sound when fully relaxed just before she goes to sleep. During the day, all peeps - no quacks.

 

[Hybridchucks]

yeah my duckies voice changed one night....its a girl congrats!