If you get killed in minecraft do you lost your builds?

Somehow I was killed in creative mode when my daughter was playing. My build is not at my spawn point because I needed flatter land. I have a general idea but don't want to spend all my time looking for something that might be gone forever

It is still there. You may not be close to it.

Unless you re playing in Hardcore mode (if you die, your world gets deleted), then no; your builds will not disappear if you die. You ll simply respawn at your original spawn point or at your bed; you might not see your build because you might not be close enough to see it.