Mucous from the rectum is to be expected. Your rectum will still produce the mucous which used to help slide the poop out. It shows it's still doing it's job. The blood is probably just left over from the surgery. The mucous is something that surgeons forget to inform people about
. Eating probably starts the peristaltic motion off and pushes the mucous out which is why you notice it more around that time.
The high white count might be a concern but as long as you're keeping an eye on your temp and report in if it gets worse, I'd trust the docs on that one.
Take care and good luck.
I have had an ileostomy for 31 years now due to UC.
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I'm not a complete idiot - some parts of me are missing!