Precautions during TWW?

Hi! I was wondering, during your TWW, do you take strict precautions on things like caffeine and alcohol?? I'm not talking about anything abusive. So for example, I usually drink one cup of coffee in the mornings, and on the weekends, two cups (this is the only caffeine I intake).  And I will occasionally have a glass of wine or a couple of beers on the weekend. So basically, should I be strictly cutting these things out in my TWW in the case that I become pregnant?