How many fertilized eggs make it to blastocyst?

I just got my Egg retrieval results back from yesterday. I had 22 eggs, 18 mature and 16 of them fertilized. Now I need to see how many make it to the blastocyst stage so they can go for the genetic testing. Does anyone know approximately how many make it this far? I was reading online you can lose up to 50% of them and my nurse said that seems extreme but didn’t really provide me with any reassurance. We want to have lots of kids and my clinic said 2-3 embryos per child we want. So hoping for at least 10 embryos to make it!!!