Doesn't a bird need a nest to hatch?

This one sure doesn't, but poor eggs....lying on that hard-cemented ground. Why not lend a hand?

Last Sunday (about a month ago) when I was having a snack, Dad told me that he found a mother bird was hatching. When Dad went closer, the bird flew away leaving two little eggs on the ground.

Then it hit me: Let's make a nest!!

I quickly went to my garden and grab a chunk of soil, and mixed it with water so that it became muddy and easy to shape. Then I took ( I don't know what's its name) the plate of a pot, you know, it's sort-of a plate which covers the bottom part of a pot to prevent soil and water coming out through the holes in the pot. So I took that, and covered it with soil and some grass.

As soon as I've finished the "hand made" nest, I went to the roof, and sure enough, there was a bird hatching on the ground. I went further ahead and the bird immediately flew away. I took the chance to move those two little eggs to my nest and put it back to its place.

It's been several weeks since I made the nest, and I haven't checked those eggs yet. May be they have become birds?