How can you tell if it's a contraction or not?

How do you tell if it's real or not? Does it kinda feel like you have to poop and cant type of pain? Its consistently happening for the past 2 I try to go and nothing. The pain lasts about a minute or less and goes away. I notice I'm doing the breathing to relax myself. I cant just go to the hospital right now bc I'm home with my 3 year old. I had a planned csection with him so I didnt feel contractions. And I have another planned csection December 9th.