LOL!
The same thing happened to me when I first got mine! 
 
I said I'd get 6 or 8. I came home with eleven.
A week later, I went out and bought 10 more!
 
Yup, they're addictive! 
 
My advice;
Do what's really best for you. Not what just seems like a good idea at the time. Think it through: "Do I REALLY need another 5 chickens?"
 
Yesterday I had to walk away from a GREAT deal on 10 healthy pullets. But I said to myself; "Nope, you have enough. You just got ducks 2 days ago! Don't overdo it,"
 
Trust me, you WILL NOT, and I repeat WILL NOT have fun with your new chicken raising experience if you rush it and overload yourself.
 
But if you think that you're ready, and can handle it, go for it! 
 
Tell us how it goes!
 
Riss