Hello @rosegirl1. Your hematuria sounds familiar (although mine involves my prostate not a uterus). Perhaps you have seen my two main points in another Mayo Connect discussion:
1) After prostate and bladder surgery, I have had episodes several times a year for four years. From the beginning, my urologist has told me not to worry much about the blood unless it is "frank" — that is, undiluted by the urine and bright red — in which case, I should get urgent or emergency care right away. In my case, the blood has always been diluted, thankfully.
2) Two urologists and two nephrologists all told me that it's not unusual that veins leak in prostate and bladder tissue that has been disturbed by mechanical surgery. Eventually (in my case, after four years), the bleeding will stop, they said.
Bacteria? As I understand it, they show up to some degree from time time in everybody's urine.
You will want to raise these issues with your own doctors — all of them — so that you reach a stable, unanimous understanding of what the problem is. Best wishes. Trust your medical team, but get answers the are satisfactory to you. Martin