I'm new to cockroaches and I've noticed strange behavior in one of my hissers. I have 4 female hissers- two adults and two sub-adults (I believe.) I've caught one of the what I believe to be sub-adults at night a few times now with her vent open, appearing to try to push something out. Basically, I'm curious to if this is something a gravid hisser might do. She tries multiple times and I have yet to see anything come out, neither frass nor an ootheca. She is round in the abdomen, and she seems to like to hide alone under bark for days on end, so im worried that she might be gravid and ill wake up to nymphs all over my apartment or something!