Just my 2 cents worth, I had a kidney infection that came completely out of the blue and I never had any urinary type symtpoms. I was treated with anti-biotics. I wasn't pg at the time, but just thought you'd like to know that it's possible to have an infection of the urinary tract (which includes the kidneys I believe) without the "urinary" bit.

But if you're not confident, just get another opinion.