I Had Two Incidents Of Hematuria In The Space Of

I had two incidents of Hematuria in the space of one week. I had an ultrasound, blood tests & ct scan with die injection. All tests came back 100% clear. Urologist said he was confident it was a small kidney stone that I passed, seeing I felt little or no pain just a slight burning sensation. Do I need a Cystoscopy ? I haven't had any symptoms for two months since initial hematuria.