When I was pg, I did.
I was teetotal to 12 weeks, when I had 1 glass of wine on flight home from Cuba. (Kept the rum cocktails in their little bottles to drink later, must do that sometime).
I allowed myself a small glass of red wine per week max, for the rest of the pg. Some weeks I had it, other weeks I didn't. One week I had a small glass of Guinness instead. I figured being relatively relaxed was better than stressed, and using red wine/guinnes were better for iron levels.
On Christmas Day, I was 40W exactly. I allowed myself a second (SMALL) glass of wine at my Grandparents, where we were having Christmas dinner. I suddenly had space in my tummy to enjoy dinner - so had 2 helpigns of turkey and 2 of pudding. Laughed a lot and relaxed after being standing or walking (managed to walk half the pier that morning- it's 2.5km) most of the day.
Later that night, most of that food reappeared to give DD more space to wriggle as she kicked her way out. So by 6am the following morning, I was starving as well as holding a squirmy bundle!!
And I do think that allowing myself relax and unwind did help a lot to things going smoothly.
I know my aunt (her 2nd was 5 mths old then, and she's had another since) also allowed herself a glass or so once a week and all went well for her.
Both of us steered clear of spirits though (and while we're not complete lushes, we would happily have a G&T or vodka and sth on occasion).