It is always possible to lose a baby, but drinking within the first two weeks shouldn't affect your chances. This from my doctor. I didn't find out I was pregnant until 3 weeks, and had just been to a birthday party where i drank 1 pint of gin. The weekend before that i had been to a wedding, and had wine. My doctor told me that amount of alcohol wouldn't have an effect on a fetus that young.
You should consult your doctor :)