holly I got judged by a midwife at my booking appointment when I said I'd been having a small glass of wine occasionally - I do mean a small glass and it was only about every 2-3 weeks. She told me in no uncertain terms to "make it zero". I got a bit angry with her as I said she was being very judgemental - two years ago the NHS advice was one to two units, once or twice a week is ok.
The upshot of me getting angry is that she red-flagged my file, and a few weeks later my GP called me in for a chat to "see if everything is okay". When I told my GP what I'd told the midwife she said my alcohol consumption sounded totally responsible, and no further action needed!
I really wouldn't worry about half a glass of fizz!