The most accommodating and understanding people are parents of other allergens and/or vegan and vegetarians.
A friend of mines husband has meat protein allergies so there house is meat free including gelatin. She has done more Celiac research than many in my family just so she understands my DD. :-)
I don't see how you can prevent the gluten from contaminating your child without stopping eating gluten or nursing, I hope for both your sakes the tests are due very very soon .