Some may disagree, but if it's just a few drinks over a week, I wouldn't worry.
I would be very wary of going out and boozing it up, though. You don't want to throw your body into a catabolic state and lose all of your gains. Not to mention your hormones are trying to recover, and alcohol isn't going to help.
I think prince said it best. (Paraphrasing) Alcohol while on cycyle is dangerous and pointless your puting a substance in your body to make you stronger or keep your gains and then you add alcohol which makes you weaker and takes away from all those hours you put in while on the cylce.
Usually best to do your best to stay away from the Alchy but if you got to - do it in moderation.