Braxton Hicks in your back?

Kk
Is that a thing? For a couple weeks, I've had sporadic cramping in my back. It feels like a throbbing tightness that lasts less than a minute. It's not painful, just very uncomfortable. They've been increasing lately. I'm up to maybe 5 a day? Can these be Braxton Hicks, maybe?
Note: I brought it up to my doctor about a week ago and she said not to worry unless it starts happening a lot. She didn't really give me an explanation.