I have just written a comment on this one then also have had 2 emails with a similar question so i will add to the blog. - I have collected hatching eggs but they have got cold overnight to 2-3 degrees, are they any good? Well to be honest no, your fertile eggs are badly damaged. Saying that if you have space in the incubator put them in as there is a small chance they will hatch. Please ensure you candle the hatching eggs at day 7 or day 10 and remove the non developing fertile eggs and throw them away to avoid bacteria damaging the developing eggs.