Mantis Abdomen Pulsating

[thebox1212]

I'm new to this mantis thing and had my mantis for about 3 weeks already. I believe its an adult since it has wings, and feed it crickets from PETCO. Anyways, recently my mantis has been frozen and seems immobile. The only part of its body that is moving is its abdomen, which is pulsating constantly. It would give an occasional jerk to its body every once in a while. This morning it looked like its usual self, so I fed it another cricket. It ate aggressively and halfway through the cricket, it stopped eating and is now immobile and frozen again, and pulsating at its abdomen. After an hour or 2 of this behavior it is still holding on to the other half of the cricket that it didn't finish. Is this something I should worry about? Is this a sign that my praying mantis is molting ( though it is not hanging upside down, my enclosure is large enough for it to hang)?

 

[CoolMantid]

They stop molting at the adult stage. If its a girl then it might be ready to lay and egg sack