Agreed, there is always a chance. Assuming you're using a wine thief (or something similar; turkey baster?) and are careful about using it properly, you'll be fine. Not sure about your methods, but I know some people add the tested sample back to the batch...I wouldn't, especially in this case.
Primary: Hard Cider, Spiced Cider, Vanilla Cider, Cinnamon Cider, Orange American Wheat
Bottled: European Pilsner, Liberty Cream Ale, Orange American Wheat
On deck: Bee Cave Brewery Kolsch, Cottage House Saison