Our cockatiel layed her first clutch of eggs recently, much to our delight. After candling, we determined all five were fertile. Mom was being a good mother constantly sitting and tending to her eggs. However, we are within a few days of the first hatching date and it appears she has possibly abandoned them. Yesterday she didn't sit on them until evening. This morning she was off of them again. We are so heartbroken. Do you think this is normal? Anything we can do to help? Was going to get an incubator if necessary...What do you think?