What I have found with pregnant robos is that they, well, get a little hormonal and start attacking the other robos in their cage. Just like humans really
So if you do decide to keep them together, watch out for any serious fighting. I've had a lot of blood shed purely because the female is attacking her mate or (more common, for me atleast) another female.
Good luck with it, the babies (if there are any) are like presents. You will be dying to have a sneaky peek but their mother will keep them well hidden!x