Newbie here. This is our first time collecting eggs and hatching. I've seen pictures of the spot or bullseye on the yolk. My question is how long do you need to wait or incubate to see this spot? We have buff orpington pullets that are laying well. I'm not sure if our cockerl (BO) is up to snuff yet. I put the first set in the incubator Sun Morning. Now Fri evening. Thought I should be able to candle something by now. Thanks in advance.