Re: maybe someone might know what this is
What does your doctor say or do about the constant blood in your urine? I'm not a doctor by any means, but when I first here of blood in the urine I think UTI (urinary tract infection) a bladder infection, or something involving the kidneys. Does this alarm them? Any pain when you go to the bathroom?
As for the change in your period, that could be natural changes are you grow. (I'm just assuming here that you're fairly young.) That's the first thought I had when reading your post.
Definitely keep on top of that blood in the urine thing. That can't be anything good.
Wish I could be more helpful. Good luck.