Alcohol before knowing you’re pregnant

So I found out I was pregnant 2 days ago. If I conceived from the night I’m thinking about, then it will have been 2 weeks and 3 days ago. However, 4 days ago I binge drank...a lot. And I know the critical period during pregnancy is between 2 and 8 weeks, when the fetus begins to grow all of the vital organs and stuff. Could I have already messed up this pregnancy from heavily drinking alcohol before I even knew I was pregnant?? SOS