I still fairly new to incubating. My first batch of olive eggs, I hatched 6 out of the 7. I set some serama egg last week. I'm on day 6. I did candle & it doesn't look like much is going on. Even when I candled the olive eggs, I could somewhat see something was changing. I'm going crazy. I bought them off the auction here. They arrive in perfect condition. Are they harder to hatch?