Thought I'd post an update.
All three eggs are fertile and have know for a while now. Tomorrow is day 53 so nearly there. Few weeks ago I could see movement and obvious blood vessels. Today the air sac is quite large. Not much to see other than a few red blood vessels so I know they are all fine. Most is very dark so nothing to really see. I am assuming another 17 days and I should start to see babies
I will probably message nearer the time as not sure if I leave them to it as they have been or increase humidity etc. Don't want to do anything wrong after getting this far. Very excited!!