You can't leave in eggs for fertilization anyway. Male schmale, even the mom'll eat a hatchling. So if she lays, they've got to come out. (Plus, you can't just leave their tank as moist as an incubator. The great outdoors has drainage. A few inches of sand in a fish tank don't. You can use a little plastic storage tub for eggs, though. I've got boys I hatched that way last year who are now as big as and bigger than their father.)

They MIGHT be stressed by being exposed to each other, and if so you will have to deal with the situation immediately, with possibilities up to and including the puchase of a second tank.

However, as is, there's no "might" about it. They ARE stressed by having less than 2 square feet per lizard. I've seen a gravid female stop running about 2 feet away from my TV-watching chair and then in one hop fly right up onto it. Unless the male is big and the female is little, I think excessive confinement is the biggest evil here.
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0.1 2006 Western Hognose (Bebe)
0.1 age unknown Cane Toad (Hengo)
1.0 2006 Northern Diamondback Terrapin (Queequeg)
1.0 2006 Madagascan Speckled "Hognose" (Sigmund)
1.0 2008 Bullsnake (Winkle)
1.2 2008 Eastern Collared Lizards (Pancho, Lupe, and Chica)
2.0 2009 Eastern Collared Lizards (Cesar and Nino)

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