Just because we are TTC doesn't mean we should out our lives on hold. I'm not a big drinker myself, it can be six months before I have a drink (from the anniversary of the day we became an item to my birthday and wedding anniversary). The way I see it, if I want a drink I will have one. The amount of women that drink in their first few months because they don't know they are pregnant is unbelievable and their babies are perfectly fine. As someone else posted, until you see those pink lines and maybe even after depending on when you find out, you aren't sharing anything with the baby as it's still only a collection of cells. Drinking isn't going to effect it.
Bottom line, you need to enjoy yourself and if having a glass of wine or two with dinner is what does it for you then do it. Besides, a glass of wine a day is perfectly healthy during pregnancy.
https://www.timesonline.co.uk/tol/life_and_style/health/article2633668.ece