Hi my 5 week old kitten eats organic cat food he doesn't drink the water I provide but I add some to his wet food. When I hold him I feel is bones and his tummy is big. A week before this I took him to the vet, he received flea and deworming meds, hes too young for the vaccines. He eats and poops regularly abd he has a follow up appointment in 2 weeks. Should I take him to the vet now or wait til it's time to go back. I'm really concerned