I would just keep offering the oyster shell as free choice. They will eat it when they NEED it. First eggs can be shell less, soft, weird shapes and such. Takes a couple of weeks to get their body into the swing of it. If this is still happening in a couple of months, then I would maybe change to a layer feed.I got my very first egg today! But...... it was soft. . Its strange cuz yesterday I was thinking that I should buy some oyster shell. So I did. Now I don't I think that they've had enough time to get used to the oyster shell so I wonder if I should get layer crumble. so I know that they're getting enough calcium