Maybe a double yoker,it's a sign of good luck for you!Plymouth as well! I also got 6 chicks in July and now all are laying. I use a heated waterer on the cold days, and a light on the coop. I have some Silkies, Austrolorp, Buff Brahma, Easter Egger, And Wyandotte's. My Easter Egger is laying green eggs-and yesterday laid the hugest egg I have ever seen-like double the others-poor thing!
I'm from Plymouth County,close to neighbors. I have several breeds for eating eggs including a couple EE'ers,I breed and incubate Red and Black Sex Links,( I call them Red or Black Stars) from my RIR Rooster,He's mean and nasty but He sires a good line of super layers!