Nur on "96 hour/4 day transfer-- how many cells?"

Hi ladies,
My doctor just transferred two fresh embryos today, Friday, after a Monday retrieval. He said the looked good at 8 cells each. But I just did some web research and noticed that after 96 hours they should be morulas. Now I am worried that they are behind and not going to take. Anyone hear of having success with transferring 8 cells on day 4? Any thoughts? We transferred 2 embryos.