Before I say my peice, I will pass to you the single best advice That id wish I had when this started: Dont Panic!
We indeed do have ribs there. But what do you mean by moving? Like a fluttering, jittering or a big blunt force or tug..? In any event, there are two things you can do easily: Go to Wikipedia (or wherever, for this it doesnt matter) andl ook up a basic anatomy of the human chest. It should help yo identify problem areass and see if anything can be seen from outside.
The second thing id get tested for would be a anxiety
disorder (if induced) or a nerve
disorder. And finally, and the most unpleasant for you to hae to go thrugh, is a bowel disorder. I am not a fair measure of pain, since i process sensory information to extremes in all circumstances (makes all things hurt in al lcases.) Pain Displacement is, if i recall, one of the major "what turned out to be nothing" events;any internal pressure can cause huge amounts of non-issues around it. it can up your chest and stomach, it can rush down into your legs (like trying to go bed with extremely dull, aching sore spots, rather than sharp splintering.
The internet, it is great for checking out a handful of symptoms and, by judging the relative probabilty of each one can determine reasonably well that they should or should not visit a doctor.
unless things get visibly worse, you are much libel to make yourself sick. I tortured myself into a constant (and without any evidence) terror of sudden death. 2 hours later id realse how big an idiot i was. That stops mattering once che pain comes.
So, again, Don't Panic :) I would check ym pulse over and over all day, until it got sore. so when i touched it, it hurt, which made me fearful and initiated the positive feedback loop.