One nut larger then the other

So laying in bed one night my husband tells me one of his nuts is 8 times the size of the other. I don't know how I didn't see it before. I mean I felt it and stuff but never got to thinking. I tried looking into it online and wasn't getting very far. He told me he was born that way. Him and his family always hint about what if he can't have kids. I finally got fed up and say is there something I don't know here and that's when he told me. Does anyone know if that brings our chances of conceiving down? I go to the doctor for a physical in a few weeks and that will for sure be a question I will ask. Just wondering if anyone else knows the answer.