Janet...
First of all, today is NOT yesterday...
Now, you've been doing Atkins for all those weeks, you know that this is not a diet, but a slow and progressive plan to manage the food choices we make for the rest of our lives.
When you totally blow it, the next morning you can regroup and readjust yourself - deal with a 1 lb. up if it's there - no biggie.
You don't have to start over, you haven't done terrible damage, your ketones are more in practice than your sugar intake, so chances are good that within a few days your body won't even remember that you beat it up!
TOM does that to ALL us women...3-4 pound gain is normal...after a few days, it all evens out and likely to give you a whooshe too!!
Hang in there...get back on your plan, help yourself to a little SF jello or LC cheesecake, and relax. Don't think "diet" and "failure" ... think great new way of eating, lots of choices, easy adjustments... success little by little.