I honestly don't think it should affect the baby at this point, if you believe you are pregnant I would stop drinking. Hope you get the answer you are searching for at your Dr's appt :)
You're two days late? Why not take a First Response Early Results tomorrow morning with concentrated (first morning) urine? It will tell you what you need to know. If you don't feel like going to Walgreen's now, just don't pee from now until you wake up, and then pee into a clean jar in the morning and save the urine, and then go to the drugstore or grocery store sometime in the day and buy a FRER and test the urine you have saved. You don't need to book at the doctor if your period is actually late, First Response will work. That way you will have all your questions answered before having to stress yourself about the alcohol question.