Thank you so much! Yes, Sandy, the other female was in with the male when we first adopted them; they were all together.

Supposedly they were all littermates (or whatever they're called in reptile terms; I know more about cats and their terminology

). So if we were correct the first time, that means both females could possibly have been fertilized so I'll need to watch them both for more eggs. But if we were wrong, and left a male in with the female, then I just have to watch the one that has already laid some eggs. Does anyone know how long they gestate? Maybe that would give me a clue as to who's the daddy (I suppose I could also book them on Montel, but that would probably take too long

)
I'm really not interested in the incubator and keeping the eggs/babies. We've got our three that we're happy with, I have no more room for more tanks! Besides, they're brother/sister so I'm not sure how good that is in geckos (I know it's okay for some mammals but not for others).
Thanks again, everyone, for all the advice.