Chickens suddenly laying bigger eggs

[Artichoke Lover]

I have and flock of 20 week old BRs and RIR hens.
They’ve been laying for about 3 weeks but this morning 3 out of 5 eggs were much larger than normal and one had blood on the shell. Is there a reason they would all suddenly start laying really big eggs? Could they be laying double yolks? This is a photo of one next to a normal sized egg for my flock.

 

[ChickenEnthusiast2000]

Hove you cracked one it probably is a double yoker

 

[JacinLarkwell]

I have a hen that lays constant large eggs. Unfortunately I don't think there's much you can do to make them stop

 

[Artichoke Lover]

Hove you cracked one it probably is a double yoker

Not yet I’ll crack one later today and check!

 

[Artichoke Lover]

Just cracked one they are double yolks! It’s odd that half my hens decide to lay double yolks at the same time. Can’t really complain though!