Welcome Woowoo and good luck.
Further to MnM’s wise words about falling off the wagon, just remember to get straight back on. Don’t wait until the next day, or the next week. We have all fallen off – it happens – just don’t use it as an excuse to binge, as that is what will cause the damage and more than likely tempt you to give up. Just say, “oops” and get straight back on, and very little (if any) damage will be done.
If you need to snack (and who doesn’t, occasionally), just make sure you have some healthy snacks with you – a couple of nuts (brazils are lowest carbs) or similar. And drink water, plenty of it, particularly if you feel hungry.
Let us know how you get on, and if you need help, advice, encouragement or just a whinge then let us know, someone is always available to help / listen. Good luck.