Blastocyst-updats

Has anyone ever experience embryos not making it to blast on day 5 but making it by day 6?? Got a call that all 6 of embryos were not quite at blast yet but the nurse told me they are not concerned they did not have to discard any. This makes me so nervous all i am reading is we should have at least some at blast by day 5.?!

Day 6, two made it and they froze. Given the remaining 4 until tomorrow to see if any of them make it🙏🏼🤞🏼