Aniexty or what?

Vanessa
This morning i felt like little pains in my upper part of stomach and it went away a few mins after I was wide awake and my chest felt tight and taking small short breaths.  Of course I started to think crazy like omg what if I'm having heart problems what if I pass out . 
So I tried to keep my mind off of it. On the train it still felt weird and sort of tight, sort of sore . Idk if I just slept really tense or if something's wrong. Right now I feel better just gets me scared. I'm in my third trimester 31weeks +6 . Idk if it's just aniexty kicking in that I'm having this baby soon!