As long as you're scared you might do that, you're probably fairly safe... (but definately very tempted as well)
Its when you start getting comfortable with the idea that you may stop by the liquor store, and start rationalizing it.... thats when I know I'm about to break.
Weekends are very hard for me too. This last weekend was my first weekend in probably 12 years that I didn't have a single drop of alcohol. I've been sober on a handful of weekends, but there has always been a beer here, or a shot there, something to take the edge off but not get me too excited. (doesn't really work though... I end up in a mental struggle not to go get more liquor).
I'm nervous about this weekend as well. I might find a good series on netflix to just veg through. If my wife will let me... most likely she'll have a list of projects that I said I'd do (while i was drunk no less) and I'll just have to power through those, although household projects are pretty big triggers for me...