So my broody hen has been sitting on a small clutch of 6 eggs and I knew 2 off the eggs had blood lines. The other 4 eggs didn't seem to have any growth so I was going to toss them out. I waited a few more days and went out last night for another look. 3 more of the eggs have a blood line. The first egg (due to hatch on the 20th) you can't even see through any more.