Gas pains? Contractions? BH?

I’m 32 weeks and all day I’ve been having some painful tightness in my upper abdomen and just recently it’s slightly been in my back as well. It is on and off but not regular whatsoever, some last a few seconds and others are closer to a minute. At first I was thinking it was gas pains but I haven’t had the urge to fart (sorry tmi) at all so I’m not really sure. I haven’t been having Braxton Hicks at all and don’t know what they are supposed to feel like. Should I be worried or call the doctor? Or just wait it out for a bit and see what happens?