If those are shipped eggs, what happens are the embryo gets a start in transit..due to rough handeling and pressure in flight through post office. the embryo cannot attach itself to proper membranes and dies, then the blood begins to pool in a ring shape...sometimes it happens when an egg from your own barn was turned too hard and you dont know your own strength sometimes ..it gives the embryo just enough of a jolt to stop its development..then it will turn into a big pool of dead material and bactieria so make sure to remove it befor that can happen.
sometimes veining and just the way it is being laid out can appear like a blood ring so be careful , that one egg (middle pic) looks like blood ring , ..the top one looks little like an embryo is or was in it might want to give just little more time if your early on .bottom one looks little more like a classic blood ring....I dont think you said what day these are..the top one I would watch little longer. just not sure what day you are on with these pictures.
so top one, little more time, looks like there is something happening around the other side of that egg..middle and bottom look like throw them out.depending on what day you are on.