I drank when I didn't know I was 4 weeks I need advice

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I found out I was pregnant at the start of my 5th week. We had been trying for a long time and I was thinking it might never happen. I had going out with friends the two nights before I found out. I had three drinks the first night and 5 the second night. It would have been in my 4th week (probably early into the 4th week) when I drank. Help! I am worried I may have done damage! Can anyone share their stories?