I have a FBCM hen and a W/Marans hen that both started to lay just over 3 weeks now. The W/M egg as doubled in size and is now as big as my RIR. The FBCM egg as not gotten any bigger and is smaller than my Mille Fluer's eggs. Is this normal? (This is my first time with Marans). With all my other breeds they got up to size in 2-3 weeks.