IVF day 6 update

I did an egg retrieval last Thursday and they retrieved 11 eggs. Out of them 9 fertilized. I got a Day 6 update saying they were able to freeze and biopsy only 2 embryos so far, and that the other 7 need more time to grow.
My other 7 embryos need 7 days to grow?
Does this mean it is a bad sign?

I don’t understand why it is so fucking difficult to get a few healthy embryos and get pregnant.

Thank you.