We are on day 4 and I decided to candle the eggs tonight. We have 16 eggs, but I was only able to see veins starting in 4. The majority of our eggs are a darker brown, so I can't really see too well. We have 3 white eggs, but they look almost completely clear. The other eggs are a bit confusing. They are dark on top and clear at the bottom. This is our first hatch, so I'm not sure what if that means the eggs are good or bad. It is early, so I didn't remove them, but how long should it be before I know for sure if they are developing or should be removed?