How Many Pounds Can I Lose In A Month Doing The Atkins Diet?

I’m only 5’2″ and weight 160 lbs. I’m going on a Caribbean vacation in a month so I need to lose some weight. I’m going to start the Atkins Diet since ppl seemed to lose a lot of weight with it. I was never over weight until like a year ago that I got into a big depression so I know all about exercises and that kinda stuff. What can you guys tell me?