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So if we use medicated chick starter does that mean we don't need cocci vaccine & just Marek's vaccine?

I have an easter egger that has been laying for about 7 months. She took a 2-1/2 month hiatus Nov-Dec-Jan. She's laid 8-9 eggs, hasn't laid now in a week, and then I found an tiny eggs about the sz of a robin egg. The shell was bumpy & appears to be pretty thick. Should I be concerned/worried?