Thanks for writing your query.
After reading your post, it seems that you are having Urinary Tract
It is not detected by a scan and needs urine examination.
You should get following investigations done :-
1. Urine examination(Routine/Microscopic and Culture/Senstivity).
2. Complete Blood Count(CBC).
You should drink lots of pure water daily. It will help in limiting/treating the infection.
Treatment can be planned according to the culture/senstivity reports of the urine examination.
I hope this is helpful to you.