Vitamin D deficiency.  Not enough Omega Threes. Another autoimmune disease like arthritis, maybe.    

Any Naturopaths on this site?

@RMJ it makes sense as it’s something I’ve experienced more than once. Currently 24 weeks and baby is doing well! Will be seeking more medical advice today 

Thank you! This is great information and perfect timing because we have our first appointment for a second opinion tomorrow.  

Bright blood in the stool would indicate bleeding down at the lower end in the colorectal area as opposed to the small bowel below the stomach where celiac manifests damage to the villous lining. Are these blood stools persistent? It's not unusual for this to happen once in a while to most anyone when a small surface vessel breaks, kind of like a nose bleed. As Scott Adams said, you must continue to consume regular amounts of gluten if the specialist will be doing additional testing for celiac disease, which could include an endoscopy with biopsy of the small bowel lining.