Yum had formed plus liquid poo this morning. She threw up water next to her downstairs litter box after passing it. Later one of the cats had wet but formed poo in the upstairs letterbox, with some mucus with some pink drops of blood. I am 95% sure it was Yum's poo. Are mucus and blood consistent with antibiotic induced diarrhea? I probably wouldn't have seen them before when it was just liquid poo. I am waiting on a call back from the vet.