Braxton hicks or Contractions?

I am having extreme lower back pain that last anywhere from 1-5 minutes. I am now starting to feel a crampy tightening sensation in my abdomen that will last about 1-3 minutes along with the back pain. These pains come every 15-20 minutes. I’m 38+1 weeks.

They have been going on all day.

Should I be concerned? Is this Braxton Hicks or Contractions?