Just keep going. You are 3 days in. I have been doing this 5 years. One day, one bite like you said, will not derail your long term goals so long as you stay consistent over the long term. Does not need to be perfect but it does need to be consistent.
I鈥檓 doing rolling 48s right now. It鈥檚 been only for a week, but hell, how often can a human being eat something by accident!? Almost every second day, when it was food-day I prepared the meal in the morning and was supposed to eat it at the evening, but tried way too often by accident. I felt like a cat someone is trying to keep away from thuna someone spilled on the floor. I spit it out if I realise it, if not, so what? It doesn鈥檛 kill me and neither does it kill you. You will get used to ur fasting schedule and it won鈥檛 happen anymore. And if it does, look two sentences before. Stay strong!
Don鈥檛 beat yourself up over this. Stuff happens. You鈥檙e human.
IF is a process that can make you more aware of how you eat and why. You don鈥檛 need to toss guilt in there. If anything, guilt will make the learning process harder.
All of us fall short when we measure ourselves against perfection.
So just keep going.
If you let little bitty things like that affect you, you are almost certainly going to burn out and fail.
You鈥檝e got to roll with the punches and constantly recommit. Focus on things that actually matter. Anything under 30 calories is not worth caring about