Early labor signs?

Savannah • Mommy to 2 babies!
I'm 38 weeks and 3 days. Recently I've been having horrible lower back pains and pains below my baby bump. Today they were paralyzing at one point. It felt like my the area between my hip bones were being tightened and it hurt to even try to move. Also, I've been having diarrhea constantly (TMI sorry). What would be causing this?