What Causes Blood In Urine While On Blood Thinners?

I have paroxysmal afib once every few months, usually triggered by something. I have had a cardiac MRI and other tests which show my heart to be healthy otherwise. I am 72, female, not overweight, no diabetes or high blood pressure and I exercise regularly. I have been on blood thinners, Xeralto and Eliquis but have blood in my urine when I use them so am not taking them now. I know my risk of stroke will go up as I age but am between a rock and hard place as far as taking blood thinners. What would you advise?