Probably gravid! I caught one in my room that was quite "Fat" and within the night it had made an eggsac. Despite my efforts at putting the enclosure outside before they hatched, I still found the little buggers in the house occasionally.
@SkittleBunny I've had it for a few days, and I figured if it was gravid I would keep her safe while she took care of the sac, but if it's just a fatso, I'd put it back where it was. I'll hang onto the little fatty for a few more days just to see what happens.