All totally normal! Yeah! Even your paranoia is normal. 
I use a stethoscope too, and even a magnifying glass. Shine your light from every angle possible, you may see it looks bigger from a different angle.
Also, if it broke the shell, then the membrane is also pierced. It can appear almost closed, but it's open.
Hold tight, you are going to see chickies soon!

I use a stethoscope too, and even a magnifying glass. Shine your light from every angle possible, you may see it looks bigger from a different angle.
Also, if it broke the shell, then the membrane is also pierced. It can appear almost closed, but it's open.
Hold tight, you are going to see chickies soon!