How many pgs normal?

Hiya

Out of my 10 fertilised eggs 3 got to day 5 and 4 got to day 6 blasts. So I feel blessed with 7 in total,

I have sent off for Pgs testing. Just because I have had a natural miscarriage before and I found it devastating so I would like to do anything possible to avoid that again

I am 36yrs - do you know what I should be expecting back normal? Is 40% normal about right? So about 2-3?

Thank you

UPDATE: for anybody reading this and looking for hope, I got 4 normal blasts!