Such good advice above. One should only compare weighings at the same time and conditions of two days. NEVER compare the first weight in the morning to any other weighing later in the day. That way lies madness!

If you do eat carbs (and that's not such a folly when you are on maintenance), your cells and liver will hold water and the material in your intestines will also hold extra water. So there's your gain. Since it's water, it is extremely temporary. Panic not, just eat closer to LC the next couple of days. Atkins says that when you gain a bit, you have Induction or even a higher level to fall back on until you lose the extra.