I put some eggs in the incubator two days ago and put a couple more in today because I was afraid that the eggs I put in wouldn't have a good hatch rate. When held up to a very bright light, I can not see through them very well. Is it only with white eggs you are able to see through well or should my eggs be less opaque than they are now? Even the ones I put in right off the bat, I could see through them after they were first laid, then by this evening I could barely see through them. Normal?