Rita, Chionodoxa seem to have the odd habit of emerging sporadically, but eventually all come up and end up blooming at the same time. Last year I thought it had something to do with being their first year in the garden, and that they would all show up together this year. Not the case though, a few are flowering, a bunch are sprouting, and quite a few aren't up yet.
Well, that's been the case with the blue ones, but not the pink- those are all at the identical stage of development.