Hello, my hen was sitting on 2 eggs for 20 days and just left them on Saturday. I put them under a heat lamp Saturday night and today (Monday) they are chirping and 1 egg is cracking. Should I put her back on them and lock her in the coop with them or just leave them under the lamp since she left them? I really want to make sure they live! Do they need their mother hen or can I hatch them myself? What do I do with them once they hatch?? Thanks so much for any advice!