belly questions!

So just for poops and giggles I tried sucking my belly in a little and it moves a TINY bit inwards at 32 weeks pregnant. I just read a statement someone made that said trying to suck in your pregnant belly can suffocate your baby.. I don't think that would be possible since doctors push on your stomach harder then the amount you can even suck your stomach in. Anyone else agree? Sorry paranoid mom here. And the only reason I noticed my stomach sucking in because I've had a cold and been coughing, sneezing and blowing my nose a lot the last few days and my stomach has been kinda achy from it!