Hi scubawife,
Given an uncomplicated/minor UTI that has been caught fairly early, antibiotic treatment should bring it under control rather promptly. Since the contemporary treatment course tends to be rather brief, often about 3 days and sometimes only a single dose, the probability of developing a fungal infection is rather low. If one does develop, it would be expected to respond to creams containing miconazole (e.g., Monistat, Micatin) or clotrimazole (e.g., Lotrimin).
Of greater concern than a yeast infection is that both UTI and the antibiotics used to treat it can be dehydrating, so make sure to drink plenty of fluids, including cranberry juice.
Finally, certain antibiotics can predispose to sunburn. If this is an issue, be sure to carefully protect against u/v exposure.
This is educational only and does not constitute or imply a doctor-patient relationship. It is not medical advice to you or any other individual, and should not be construed as such.
Regards,
DocVikingo