Embryo help

We went to our transfer today and got some pretty shocking news... I posted a few days ago but we had 28 eggs retrieved, 17 were fertilized and growing normal on day 3. We went in today and they told us none of our embryo had grown past day 3 and were graded at C. They transferred these two (the best looking ones) but told us to not get our hopes up. I’m feeling so discouraged.

Has this happened to anyone? Did you figure out was was wrong? 😢 I’m just beyond sad right now.