I found these in my indoor cat’s bed but didn’t find any fleas on him with the flea comb. Also, they don’t crush when i squeeze them. Could it be litter? And if it is flea eggs and I don’t find any fleas what should be my next step? My cat is on Revolution drops and my dog is also on oral Bravecto. Didn’t find any fleas on my dog either. Thanks for your input.