Hi hun - are you on the USA CD? Or over 5' 8"? Cos the UK one is 3 packs a day for most women.
I was told at my training day that the occasional use of an extra pack is ok, but of course will up your calorie count and carb level, so could knock you out of ketosis. Have read just now in the CD newsletter that if you have a strenuous job or exercise vigorously, you might need an extra pack to give you more energy.
HTH