Probably the beginning stages.
With DD I was so uncomfortable, like first day of a really bad period, the day before. We were sitting in a restaurant and it hurt to sit in the booth. Just crampy and yucky.
The next day, after the pains subsiding when I went to bed that night, my water broke at 11am.
I would say REAL contractions started around 4pm that afternoon. REALLY REAL REAL contractions came at 11pm.
I could barely get a sentence out. I couldn't sit while having one. And it just hit me like waves.
I did back labor... so I was really confused as to what was going on. But when the back pains wouldn't stop I knew it was labor.
Try laying down. Drink some water. Relax. Don't stress out about timing them until its consistent waves.