I didn't experience blood in urine but unless yours is bright red, it is likely scabs just falling away. I was advised that retaining urine comes in three stages. Lying down, sitting and eventually, whilst standing and moving around so it sounds like you are normal and doing quite well. The specialist pelvic health physio I saw last week and my surgeon with whom I consulted last week both advised that continence, for the average man, can take anytime between 3 months and 6 months plus and that, as I am making slow progress, I should not be concerned at this time. Of course, some are outside of these parameters.