I was one that stopped when I started trying. This time though, we weren't trying. I didn't think anything of the sips, or even the glass of white wine I had, but would definitely avoid anything hard. My husband and I were going to celebrate our anniversary early with a really nice bottle of red, and before opening it, I wanted to make sure that I really wasn't pregnant - just in case, since I knew I would have more than a glass. Turns out I was, so that bottle went back to the cellar.
When pregnant (and other times too), I do avoid caffeine, fake sweetners, and alcohol, so, depending on what you plan to stop if you do find out, what is two weeks without? If you are truly trying to get pregnant, then again, that is up to you to decide what you will/won't give up. I would drink during my cycle, and then abstain the rest of the month, but that was just me.