L.O.
While I don't have an answer for you. I have had a kidney infection while pregnant (bladder infection went into my kidneys) and I was absolutely miserable!! I was admitted to ICU (intensive care unit) for 5 days while they shot me full of antibiotics and tried to keep me hydrated. There is a fear of you going into labor early and depending on how bad the infection is, they may have to take the baby early in order to get you to heal. In my case, I was very close to having to have my baby early.
I know they are working on trying to get you the right antibiotics, but I would push the issue. Maybe they can admit you and do intravenous antibiotics?? I wish you the best!