L., I am a worrier too, so I know how things can just eat at you. But I really feel you have nothing to worry about in your case. You found out SO early that you are expecting. Most people in your case may not have even known they were pregnant. Those little embryos are much stronger than you would think.
I took a test before we went away for our anniversary, it was negative. My husband and I went out and I drank the whole weekend(not obnoxiously).
A week later, I took a test, it was positive. So I was pregnant when I drank. I was so paranoid the whole pregnancy. Please don't worry yourself! You are a good mama, and I am sure everything is just fine! Congrats on the new baby!!!