Drinking before you know you're pregnant

I was not trying to get pregnant, so our little bundle of joy was a complete, unplanned surprise. This means I did not alter my drinking habits, and between conception and finding out I had been to several football tailgates and celebrated my 28th birthday (i.e. fair amount of drinking). I of course stopped as soon as I knew I was pregnant (a few days after my missed period), but I'm anxious about the drinking that occurred before I knew. I feel like this has to happen all the time to people who get pregnant accidentally, but there's so much judgement on this board about mothers having even a sip of wine now pregnant. It makes me nervous that I did some irreparable damage before I even knew I was pregnant.