You have it a bit backward here, female are gravid once they have ovulated.
Ovy to pre-lay shed 14 days
Pre-lay to egg laying 27 to 35 days
Of course those are average but it give you a good idea on when you should get ready to get eggs.
Well thanks I just figured they were gravid first because another member stated their female had been off food for a month before its ovy. But thanks anyways for getting me the correct knowledge