This is my first batch of chickens. I have 8 rir pullets and one roo. They All are 21 weeks old. I have been patiently waiting for eggs and this past Sunday at around 4-6 pm i got my first egg. It was a very large tan egg and when i cracked it monday morning for breakfast i found it had two yolks!! I checked the nests every few hours on Monday and no eggs. About 9:30 pm on Monday i went out to close them in the coop and i checked the nests one last time and i found a shell-less membrane only egg with the membrane split open. I quickly cleaned the egg mess up and went to bed. From what i've read abnormalities can be expected when pullets first start laying. Is there anything else i should do or just let nature take its course? I am finishing up the bag of 20% starter that they are eating now before i switch to layer rations but i do mix in some corn and wheat to bring the protein level down to around 16-17%. They also have crushed oyster shell free choice. Any advice or shared experience is very welcomed. Thank you!!