Here is one of the sites I use. As for getting rid of them (the ones with no veining) I would have left them a few more days. I never remove an egg unless it stinks or is turning black with no veining.
http://www.ianrpubs.unl.edu/epublic/pages/publicationD.jsp?publicationId=62
http://www.ianrpubs.unl.edu/epublic/pages/publicationD.jsp?publicationId=62