In the future it would be wise to take the advice you get on this board. Since you are new to this here are a couple tips.
1. Always spotlight the egg to see where the veins are so you can avoid them when cutting.
2. Pinch egg before you cut to make sure you dont cut the snake.
3. Cut in a V shape to make a closing flap. That away you get to see what it is and you can close the flap back down so the egg stays sealed better. Some times when totally exposed like yours they can begin to mold. (Experienced it)
Furthermore congrats on your new baby ball pythons! And good luck on the others.