Hello everyone, i hope this posts in the right place. If not please forgive me. We are having some issues with candling our mallard eggs. We have had our eggs in a home made incubater for eight days now and can not see anything when candling. The only change I have noticed is the yokes have gotten darker. We decided to incubate becouse the outside temp started to drop below freezing and she still wasn't siting on the nest. She just kept laying more. She got up to 18 and quit. Then two days latter she started laying more and now has 3 in the nest. She kept kicking one out so we brought it in and candled it and didnt see anything. It was even hard to see the yoke. So we cracked it open to see if it was fertil. It had blood veins! As well as two blood spots, one on each side of the yoke. My question is why are we not seeing the veins when we candle. I feel horrible that we cracked open a good egg. Please help!