Jackie-
You might get a doc to respond. And if you are lucky, you might get a paradox. (I love straight lines.)
I am curious as to why you would want our opinion as compared to RDs, that would be real docs.
Nevertheless, Beta Thal Minor exists is two forms, plus and zero. Hemoglobin is composed of for protein chains, 2 alphas, and 2 betas. In view of your description of yourself and your activities, I am quite sure that you have the plus variety. This means you make some of the beta chains. One of your genes is good and the other one is not.
In reviewing BTM with my super secret source (If you want to know who or what it is, I would suggest you Google it.) I found nothing to suggest that you could develop hematuria as a result of carrying this one bad gene.
Goolge this: march hematuria . I think that you will find a plethora of website confirming that you have nothing to worry about.
As my cousin the doctor told me, urine the pink with hematuria.
JayR