My crested gecko is not eating?

i got a crested gecko a few days ago, his name is milo. ive given him time to get used to his surroundings and get confurtable. i give him crested gecko diet mixed with water and gut loades crickets. he hasa a few hides , warmth and nice bedding. i don't kow if hes not eating because his about to shed or is sick? his pads are not very sticky so im guessing he will shed soon....