Listeria?

Has anyone knowingly come into contact with listeria and not had any side effects? I had been eating spinach salad 1-2x a day the first severak weeks of my pregnancy and then suffered a miscarriage and the say after my d&c saw on the news that the brand of spinach i had been eating has been recalled due to listeria. I am wondering if this could be what caused my miscarriage without me having any effects of it directly? I am ao broken hearted and concerned that it was bc of what I ate.