Ok so my isa brown is sitting on eggs and earlier today i watched her sibling crack an egg. (afterwards i blocked the broody hen off.) anyways i checked the egg and the most i saw was a tiny tiny splotch of blood. She has been on the eggs for almost 4 days. Is this normal? I candled 2 others and noticed no veins or anything of the sort... And they should be fertilized... I do have a rooster.