10 days on keflex for strep b group uti, still symptomatic, i.e., frequently need to urinate - but urine clear, could this be a kidney infection ?

Not necessarily: You might have a partially treated infection - majority of the bacteria have been killed but there are enough to continue to cause symptom. You may need another course of antibiotics - check with your doctor. Kidney infection generally makes you feel sicker - fever, nausea, vomiting, flank pain - because the infection is no longer contained in a confined space.

UTI: You have irritative symptoms, not necessarily a uti. Avoid spicy foods, caffeinated drinks. You may need a medication to relieve the symptoms, see your doctor.