The eggs our pullets lay are variable in size, but they are usually medium to large. Occasionally we get an extra large one, which doesn't fit in the egg holder in our fridge door very well. The other day we had one which was too big for an egg box. When we weighed it, it was about 120g or 4 ounces and 7.5 cm or 3 inches long. I took a photo of it next to an extra large egg. You may even be able to see that the shell was a bit wrinkly. It turned out it had a double yolk and it made lovely scrambled egg.
We did check and Amber, who laid it, seemed absolutely fine, but it was a bit worrying. She gave egg-laying a rest today, and who can blame her.