I am noticing red maroon few spots mixed in stool from 3 yrs. I thought it was blood. I had my stool occult blood test done on 2 alternate days. But it came negative. There's no pain while passing the stool. Some days stool is normal some days it is somewhat semi solid and in peices. I am afraid of cancer but my stool occult blood test came negative 2 times. Should I be concerned about it? There's no other symptom.