Incremental update for today:
Of the 8 that had fertilised yesterday we have 8 at 2 cells.
Of the 3 that had not fertilised yesterday we have 1 that has fertilised and started dividing.
The 1 that fertilised abnormally yesterday was not multinucleated, it is dividing, but it does not look pretty. (But we might have got our conversations confused and that could possibly be more info on the late fertiliser.)