Contractions? What’s going on? Help!

Been timing contractions this evening. Well Braxton Hicks... but it’s weird. I feel a cramp or pressure in my lower back first and then it feels like more cramping presurefeeling and then it grows and grows into more squeezing and then the Braxton Hicks feeling like I can’t breathe. And it’s like things sorta seize up from down in my tailbone to the top of my uterus but its not horribly intense yet. But it seems to be in a kind of pattern.

I’ve never been in labor before so idk what to expect.

Edit to add: I’ll be 38 weeks tomorrow. I don’t plan on going to the hospital til as close as possible to when the baby actually is coming out. I want to labour at home as long as absolutely possible. But just wondering if this seems like the start. Guess I’ll go to bed and if I’m able to sleep it’s a false alarm lol!