blood from anus

Hi need advice please! My boy Ferdinand is not doing well, took him to the vet wednesday because he wasn't eating or pooping. They prescribed a motility med and pain med and filed some teeth (he has a history of teeth issues, mainly spurs and is not a big chewer so his front teeth can overgrow slightly). Tonight I picked him up to hand feed him and saw a small amount of blood from his anus.

He isn't lethargic but is stretching his belly occassionally if that makes sense

I have tried calling my amazing vet but they don't have anyone to see him in urgent care. There is one e-vet that sees exotics but not really knowledgable about chins, so, should I take him to that one or see if I can get a monday or weekend appointment with someone who knows chins specifically?

Thanks