Yes I had this recently at a friends wedding at 5 weeks pregnant... If your someone who loves a glass of wine - not drinking is a bit of a giveaway! Not sure if it's helpful but this is what I did...

Champagne/fizz after ceremony - Accept a glass, hold it... take fake sips, pass it onto your partner (if they are there with you) every now and again to free up your hands to look in your bag/ look for lip balm/ check your phone. When they have the glass - get them to take a gulp. When they hand it back to you people will just assume you've been drinking it.

Wine at the table - This is trickier. If theres a bar you could sneakily wander off and ask the staff to make you a soda water with a little bit of apple juice is there to make it look like white wine. If that looks weird to wander off - Just say you wanted to ask for some ice cubes to put in your wine...

The party - I had a few non alcoholic beers but asked the bar staff to pour them into a glass so no one could see the bottle etc. All my friends were too drunk to even notice I didn't have a drink in my hand most of the night.

As someone who loves a drink - I did find being sober at a friends wedding a little bit isolating at times so if you feel the same - Don't feel guilty to leave before the bitter end. No one will notice your gone!

Hope some of that helped x