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It didn't really look fertile in the first set of pics you posted, but in the last set it definitely is. Sometimes when eggs sit out in a warm area, the cells start to spread apart and multiply, which makes things look way clearer. I'm guessing that's just what happened. Yes, definitely...

Looks fertile!!!

Congrats! Yep, you can start setting now. The worst that could happen is you have a few infertile eggs.

X2.

Yup! In some cases even the first egg after mounting can be fertile too. I would say the second does not appear to be fertile. The first definitely is though. Are those eggs from today?

The first one is fertile, I don't believe the second one is. A hen will start laying fertile eggs after two days of being exposed to a rooster.