Good advice in all responses. This situation has happened with most of us. It will not derail you to the degree you think. Getting into ketosis is not that fragile and temporary. However, initially your metabolism has to adapt, and it can "go in and out" occasionally. Over time, your metabolism will become adapted, and you'll find it easier to stay in ketosis even with a few indiscretions when eating carbs. Staying consistent over time protects you when diet variations occur.