Having Blood Spots During Urination. Was Treated For Yeast Infection. Spotting Persists. Prescribed Tests To Check For Bladder/kidney Cancer. Advice?

Yes, I have been having some watery red spotting after I wipe when I go pee pee. I have been the the doctor three times and I gave them a urine specimen. The first time, doctor diagnosed me with a UTI, but wasn't sure if it could also be a yeast infection. So, she prescribed Bacterim for 5 days but it gave me diahhrea so Dr. changed it to Cipro, which worked fine. She also gave me a one time pill to take for the yeast infection after finishing the Cipro. I took all my medication. During treatment, I saw a little spotting of watered down blood after wiping my pee pee. Dr. took another urine exam. Said I never had UTI but that I definitely had a yeast infection. I finished all my meds so I waited to see if I would be okay and it seemed as though I was. Yesterday, when I went pee pee, I wiped and saw some more watered down red spots on the tissue. I returned to the Dr. today who ordered a urinalysis. He is having me worked up for bladder or kidney cancer just as a precaution. Still don't know what is causing the sporadic blood spots. Pls. advise.