My husband tested negative for prostate cancer, but now has blood in his urine. What could be causing this?

Biopsy. If it was a couple weeks after the biopsy, you have your answer. Either way, see your urologist.
Biopsy side effect. If he had a prostate biopsy to rule out cancer, the blood in his urine is likely coming from this and should clear rapidly. Otherwise, he needs to be evaluated with a ct scan of his kidneys, a urine test for cancer and cystoscopy, a camera test looking into the bladder.

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I have blood in my urine post 6 weeks scope to bladder for prostate cancer side effects, it happened after sex?

Possible, but... Seeing gross hematuria after intercourse under your reported scenario is possible, but bears no alarm as long as voiding comfortably & have no fever. To help undrstand bloody urine in general, view article in For life reality, view lists of Facts of Life-1,2,&3 by clicking the BUTTON on the left side of HOME of Best... Read more...