Most likely, not...
Most UTIs in sexually active females occur within 1-2 days after intercourse, but have to be confirmed with proper approach and documentation like those described in http://www.
formefirst.com/eNewsletter06.html and in UTI & Troubling Urination
in http://www.formefirst.com/UTI.html. Thereby, you gain insights on how to handle your urinary concern so to reach right diagnosis for right care & counsel