Drink until Pink, HELP what does it really mean

Right now I'm working about 14 hours a day. After I put the baby to sleep, I like to enjoy a glass of wine. Im currently about 5DPO, with pretty good signs of pregnancy. Obviously I can't test positive yet, but I'm wondering if drink till pink is a good idea, especially if I have a gut feeling we will get BFP this month? I'm having lots of prego symptoms (I know implanation hasn't happened yet, but I'm pretty in-tune with my body). Advice on drink until pink please.