Hello CnG! Good for you for jumping right back on that sobriety horse. Three weeks is amazing and you should be proud of that. You had a slip. Now you know the consequences. Next time you find yourself in that situation, simply think the drink through. Think to yourself what mostly likely will happen if you have that one drink. Then think about how great you felt not drinking for 3 weeks. I hope you personally feel proud of your 3 week sobriety!
PS - I love your user name. Every time I see it, it makes me smile. It has such a happy ring to it!!