Poking/pulling in upper belly

Sometimes when I move (roll over, sit up or twist a little) , I get this very strange feeling in my upper belly. It feels as if a muscle has pulled or it even feels as if something is poking my belly. The best way I can describe it is as if someone took a stick and poked me in the belly, it's not painful just very weird. 

 Does it sound like a pulled muscle, a hernia, abdominal separation, or normal??? Side note, I do have an anterior placenta, do you think this feeling could have something to do with the placenta? It does not feel like the typical round ligament pains I've experienced. I'm kind of freaked out about it. Baby is still active as ever, no other concerns.