Laura, we had a clutch last year with a couple of small (about half the size of the others in the clutch) boob eggs and I didn't give them much chance of going full term. They fooled me and we hatched out a healthy baby from each egg. They were considerably smaller than their siblings, but had great appetites and quickly made up the difference.
We also had some "window" eggs and if I'm not mistaken all of them hatched with no problems.
Good luck with yours.