I'm up a couple of pounds so far too. I think that's nothing and you should give yourselves a break. As soon as I sniff a carb, a chocolate or a glass of wine I put weight on. In the summer I put on 7lbs in two weeks on holiday but lost it within 10 days of starting the low carb, healthy eating again. I expect my Christmas weight gain to disappear fairly sharpish too.
I have been more restrained in previous years and had smaller portions of the things I love and skipped the things I am not bothered about. So less alcohol but still a fair bit of chocolate. And less roast potatoes but a mountain of roasted veg and left room for the cheese.
Got a Twixmas catch up with a friend on Saturday which will involve a long walk so I've decided that is the time to get back to normal eating. Apart from New Year's Eve and New Year's Day lunch which won't be as boozy or treaty as previous years.