As an alcoholic, I am often tempted to drink. So I think that I could maybe have one drink and not say anything to anyone. And before my current fabulous string of 8 purely alcohol free days, I did once or twice have one or two drinks without drinking to blackout.
But if on Wednesday I could have two beers, on Saturday I would try again. Sunday was a loss. It is about the first drink. And if you feel bad about not telling, you probably shouldn't be doing it.