We have (2) day 25 duck eggs, have seen slight wiggling of egg, and when candled I see movement on the small side of the air cells- that is on the side they should not pip. It looks like a shadow, but it does not look like the pictures of internal pips I've seen, not pointy at all. Is this an internal pip? It is normal? Reliable resources for hatching duck eggs? Having a hard time finding info. Thanks!