Since all of the duck eggs we put in our new incubator were fertile and are still growing after 14 days, my daughter decided to add a couple of double yolk eggs too to see if they would grow. We candled them today at day 3 or 4 and they both had two embryos in them. Will these grow like this? Can they hatch together? Has anyone done this before? We're really curious to watch them growing but I hate to have them develop and then not hatch because they don't have room.