Is this good or bad? What are your experiences?

10 eggs from retrieval. 7 mature and 6 fertilized.

On day 2 we still have 6 embryos but two of the 6 are slow growers and may not make it.

4 of the 6 embryos have 3 or 4 cells.

I know day 3 is a big day for embryos and we have a transfer scheduled for tomorrow. I asked why they are doing a 3 vs 5 day and she said because we have 2 embryos with 4 cells. 🤷‍♀️