Just give them a dish of oyster shell now, and quit overthinking it.Hmmm sounds like now or next month. Maybe I'll wait till i find an egg to put out oyster shell if it's safe too.
(Yes, I'm referring to your user name.)
It is normal for pullets to start consuming more calcium before they lay the first egg.
Either one should be fine.Do i have to use straw or is pine shavings okay for the nesting box