UTI/Urinary Tract Infection possible UTI?

Today I noticed a little blood in my guinea pigs urine. I know this is a sign of a UTI and I'm going to try to get him into the vet on Monday since they are closed tomorrow. However is there anything I can or should be doing until then? So far he's been acting perfectly normal and he's eating good. The only symptom he seems to have is the blood in his urine.