Drinking while pregnant.

I am 7 weeks pregnant and just found out. On Christmas night I drank one vodka and orange juice, and one glass of wine. I feel like I'm just worrying for nothing and as long as I don't drink anymore (which I obviously won't) it should be okay. But I've been reading up on it and I've seen some very different things such as don't drink til your 20 weeks along, so don't ever drink in the first 6 months... Does anyone have any soothing advice or facts for me..