When I started the Atkins diet I was completely unaware of "hidden carbs" in many foods. Although I was allowed 20g of carbs a day during Induction I soon realised that the only way I could possibly stay within my limit was to think of it as a "NO carbs" stage of the diet and the hidden carbs (minute amounts of carbs in cheese/eggs) would take care of my 20g allowance.

Yes you do need some carbs - we will get what we need by sticking to a high protein diet.
Take care.