
Everything
will be o.k sweetie.
My heart goes out to you. I know you are sad. I can't imagine what you are going through, but this will pass.
You did nothing wrong. Sometimes an egg does break inside a hen, it just one of those things that happens. There's nothing that you could have done to cause it.
Culling the birds that were sick and were causing health problems within the flock was a practical decision you made. It's part of keeping chickens. Hopefully this stopped the spread of illness within the flock. You are already starting to see improvement within the flock already!
Take a little time to grieve the loss, but you 20 chickens left that need your attention and care. 20 chickens can bring a lot of joy if you let them

I know it's hard to suffer loss, when you care so deeply about them, but everything in life has a season.