I just got a new kitten, 7 weeks old. He has been in the house for about 2-3 days and has gone pee multiple times and pooped once. He is litter trained, but he has been chewing on litter. I am unsure if he has been swallowing this litter and how often he chews on it. I cannot see a vet until next month. When should I be worried about this litter blocking his system? Is this a common or does this easily occur with a few grains?