I was quite the wild child before finding out I was pregnant.
I was terrified when I found out , I had done some pretty hard drinkign myself.
Everything turned out fine and Bella is perfect.. everyone is different, and I completely understand the guilt that is associated with it.
All I have to say is it happens all the time, and the babies are fine. So long as you take good care of yourself and quit the bad habits during pregnancy Im sure everything will be fine.
When I discussed it with my doctor , he pretty much told me me stressing about it was probably worse for the baby then the few times I drank, obviously it's not a good thing, but sometimes these things aren't planned and you really have no way of knowing your doing anything wrong