Dull ache in lower right side had misscarriage couple months ago. x-ray and ultrasound clear. occasional blood in toilet. chronic constipation. cause?

Constipation: Most likely the ache & the prior miscarriage are now unrelated. The probable cause of ache is chronic constipation. Presume occasional bright red blood is from straining to pass stool resulting in micro trauma to the anus. Work on constipation: push fluids, dietary fiber, daily exercise. Make sure you don't have a fever..a pelvic abscess is a remote possibility. Return to doc if doesn't improve:)