Remember that the day-to-day scale will always fluctuate, and pounds from a couple holiday meals are almost certainly water weight. 3 pounds is 10500 calories and unless your holiday meals were entire sticks of butter, you should be fine!
Instead of going overboard and punishing yourself, ease back into things. Maybe put in a bit of extra cardio or some extra steps, but remember that its a lifestyle - a marathon, not a sprint. I always plan for ‘cheat’ days around holidays, because even if it costs me a week to compensate, I’ll have those happy memories rather than being constantly worried.