Lock down for the newbie day 18
If they are true Ameraucana, they will have the blue egg. In that case, the shell is super hard to see through. I candle at day 7 and i can see veins and a dot. Then, as you candle later in the game, you will see a shadow bouncing around like crazy inside the egg. Day 18 you may not see much movement when candling because of the chick being slightly crowded. Do you have pictures? Did it look like this?