Oh, one other thing... shine your light down into the air cell end of the egg. You will see the veins more that way than from the pointy end. Especially at first. You will still want to check the pointy end, but up by the air cell will show you the quickest development.
And you also want to monitor the size of the air cells to make sure they are losing the right amount of moisture.
And you also want to monitor the size of the air cells to make sure they are losing the right amount of moisture.