I was actually quite surprised that people DIDN'T notice I wasn't drinking for the first three months. I think you just become a bit paranoid about people becoming suspicious. So try not worry about it, just enjoy your big day.

Several years ago I went to a posh restaurant with a friend for my birthday. We ordered a bottle of champagne and after several topups I said to her "Wow, this is a big bottle of champagne. I'm sure this is my fourth glass." She said "yeah, I'm feeling a bit light-headed." A few months later, when she announced the pregnancy, she told me I drank most of the bottle on my own. I never noticed she didn't actually finish her glass. But I kept going on and on about how big the champagne bottle was. D'uh!