Aw, Dej.

Step hangs out in many areas of our body, not just the throat. Before you and DH beat yourselves up about this, remember you were just in the hospital, with tummy issues no less. The strep you have could be a Strep D which normally hangs out in our gut and is known to cause UTIs as well. It is not too uncommon to get this during or after and hospital visit. Strep B could be an issue too as it hangs out in the "lower" region. While generally you hear about this in pregnant women/newborns of a mom with Strep B, you could be a carrier for it as well. Thow in a weakened immune system and these buggers will colonize and grow more rapidly.
To sum it all up, not all Strep comes from the throat. I guess you can ask your dr which type of strep you have. That might make you and hubby feel better.