Don't fret.

It happens to the best of us Really.

Normally it takes about 48 hours to get into ketosis. So if you start back on low carbing tomorrow by Tuesday you should be okay You may gain a few pounds to water weight gain for the carb intake. I believe carbs attract something like 2.7 grams of water to it's 1 gram.

Hang in there and don't beat yourself up to badly.