Braxton Hicks vs Baby Moving

I’m 36 weeks and a FTM and have no idea what Braxton Hicks should feel like. I’ve heard a lot of conflicting information about what BH are and how they come about and how they feel.

My question is, how would you describe them? Periodically, I experience this super uncomfortable thing where everything feels super tight and squeezes in my belly. But it’s almost like the baby is pushing himself out really hard too, and it makes my belly super lopsided sometimes. Is this BH? Or is this just the baby moving and causing pain? It kind of takes my breath away for like 20-30 seconds, and then everything relaxes. I just can’t tell whether or not that’s BH or just the baby, or both! Does the baby typically move during BH or push out?