Candling eggs in duck nest

[Momsbusiness]

I have a young Blue Swedish Duck laying on about 14 eggs. Some are dated may 3 as I put them out to encourage her to sit on them and lay more to sit on. Big mistake I'm sure. Any way I have candles a few here and they're and put them back in the last couple of weeks here and there. It's looks as though they are almost all viable and developing. But I have been reading that I might have turned them up side down and caused air pocket issues with the developing ducklings. Can I safely bring several at av time in and candle them better then return them to her nest?

 

[Miss Lydia]

I candle all the way up to internal pip once I see that I leave the eggs alone until mama is up with the ducklings. Or I feel something is wrong. If you see an internal pip lay the egg where the pip is facing up.