Please explain contractions

Mia🖤 • Mommy to my baby boy 1-13-2018💙👶🏻

What do contractions feel like?

What do I look for?

I’m getting hella cramping and it becomes painful and feels like it’s tightening too but it stops.

Someone help me out and explain to me what they feel like and how you know it’s labor

I’m 37 + 6 I’ll be 38 weeks tomorrow