drinking wine during pregnancy

I have a family member who is almost 20 weeks  pregnant with her 3rd child and has had multiple miscarriages and has been drinking wine since she found out she was pregnant. Not daily, but I would say weekly. Every time her and her husband go out to eat she has a few glasses. I find it EXTREMELY irritating, considering I've been trying to get pregnant for years now and have done everything "right". So my question is what are your thoughts on drinking wine during pregnancy. I was told by an obgyn that 1 glass early on wouldn't cause any harm, but what are your thoughts?