chooks still not laying

hi everyone our hens havent laid any eggs for about 2 weeks now,ive only got to layers at minute anyway until other 2 are at pol which will be about spring next year. they are all eating fine,im keeping coop clean and no infestations off any kind,tehy all look fine and full of it. someone said about putting a couple of fake eggs in there any ideas welcome?? cheers liam