Killed a baby chick today

In my grade 1 classroom, we are knee deep in growing things. We are watching tadpoles grow legs. We are watching silkworms molt and prepare to cocoon. And our tour de force incubator act includes (d) 15 chicken eggs and 5 duck eggs. Many other classes have come by and watched while I candled eggs to show them the growing embryos-- extremely cool thing actually to be able to seeing the developing baby fetuses.

Anyway, after the students of 2C left, I realized that I couldn't see anything in two chicken eggs. Having read that that was probably a sign of a non developing embryo, I culled them from their siblings and opened the eggs. The first egg that I opened had a barely developing yolk and had indeed stop developing. In the toilet went that one. The second egg, however, was hard to open and had a thick sac-- that should have told me that I was doing something that should never be done, particularly during Holy Week. So, once the egg was opened, what's a girl to do? I cracked the shell further and discovered to my horror a small black chick with a beating heartbeat--- AAAAAAA. I cried out and stashed it into the trash can in the bathroom. Then, like, Lady MacBeth, I washed my hands over and over. I just can't believe that I, protector and lover of all things small and furry, killed a chicken fetus. Just can't believe I did that... What if that was the only viable egg and now it's gone?? I have vowed to stop handling the eggs all together. Just so wrong....