This is normal and don't be surprised if you also see feces exit your back end. With a loop ileosotmy (temorary ileostomy) it's possible for food to by pass the appliance and head south. It's normal. The mucous and blood you see are shedding of cells and it's considered to be a sign that all is healthy.
dx proctitis in 1987
dx UC in 1991, was stable until 1998
1998 started prednisone, asacol, pentasa, nortriptylene, ativan, 6MP, rowasa enemas and suppositories, hydrocortisone enemas, tried the SCD diet, being a vegetarian, omega 3s, flax, pranic healing, yoga, acupuncture, probiotics
2000 lost all my B-12 stores and became anemic
2001 opted for j-pouch surgery- now living life med-free