See picture below: Is this normal for first-time layers? We have two Khaki Campbell females that are laying eggs with shells a little softer than the eggs we are getting from our other females (we purchased our others as adults so aren't sure what their eggs looked like at first). This egg in the picture came from one of our female Pekins (that has also started laying recently). We have six female Pekins and have gotten a couple of large eggs (assuming it's from one of the Pekins and not our other ducks). I'm not sure if this could be her first egg and I'm not sure if you can tell much from the picture, but the whole thing is soft, cut in half and has nothing inside, but a little bit of the stringy "egg white" substance. I also found another one in similar condition on the ground nearby.
Right before I found this egg, I noticed one of the Pekins laying down. (We were letting the ducks free-range, which they don't normally do and all the others were foraging, so I thought this was strange behavior). Anyway, she seemed to be uncomfortable and her tail kept moving up and down. One of our Khaki Campbell drakes came over and started trying to mate with her. When I went to run him away, I found this egg. She seemed okay after this. Should I be concerned or is this normal? I know that there is a condition that ducks and chickens can get where they are unable to pass eggs. I just want to make sure this is not a warning sign for something bad. Please help.

Right before I found this egg, I noticed one of the Pekins laying down. (We were letting the ducks free-range, which they don't normally do and all the others were foraging, so I thought this was strange behavior). Anyway, she seemed to be uncomfortable and her tail kept moving up and down. One of our Khaki Campbell drakes came over and started trying to mate with her. When I went to run him away, I found this egg. She seemed okay after this. Should I be concerned or is this normal? I know that there is a condition that ducks and chickens can get where they are unable to pass eggs. I just want to make sure this is not a warning sign for something bad. Please help.