I think women, like your wife, have more experience seeing blood in the urine, so they tend not to panic as much. At least, the women I've known. Like the nurse said, if there wasn't much, and it stopped, it shouldn't be a problem. You probably had more blood after your biopsy, right?
This is exactly right DJ about
women and blood in the urine. LOL.
I once gave a urine specimen to my GP, and apparently I hadn't wiped, or urinated enough to flush the urethra, and the GPs test found "blood in my urine" even though I saw nothing. They really had a fit and I had to come back and give another test. They really had me concerned.