The report is in. All four embies made it through to Day 3!! 
We have 2 x 8 cell embies, and 2 x 5 cell embies, all suitable for PGD biopsy.
So after many questions and discussions with our dr, we have been assured that the PGD itself does not harm the babies, and given that we still have 4 its best to take them to day 5 to see which have the best chance of making it.. so thats what we're doing.
ET is still scheduled for Wednesday and the waiting game wondering if our babies are ok continues...
In the meantime, we are off to Disneyland to try to distract ourselves!