I cut it off at the beginning. Before the egg is fertilized it is not and cannot be a chicken.
The seed/tree is a little more iffy though. It makes me think of implantation vs fertilization, so maybe it should be considered a tree even unplanted.
It isn't about potential or not, but about what it is. A fertilized egg, chicken or human, IS chicken or human. It isn't potentially that, it already is that just at the earliest stage of development.
An unfertilized egg may have the potential, but until it is fertilized it isn't human life anymore than semen on its own is. That unique DNA must be created. Which of course is why yeah, I support the seed of the tree should be considered a tree planted or not, just at the earliest stage.