Blood in urine after bowel movement. Had rad. Prosect. 6 1/2 weeks ago. Passed 2 blood clots today. Any need for conern?

Unlikely. You are still well within the normal healing period when your body can pass clots. As long as you are not developing new pain, fevers or continuous severe blood in urine, you are likely ok. If it persists or you remain concerned contact your urologist to discuss.