is this labor?

I started off early this morning with a couple painful contractions. Since this morning I have had belly tightening all day every 10 minutes or so (I'm at work at meetings all day so I haven't timed) since around 2 I have had on and off cramping getting more and more painful. It's hard to time it cause it feels like they're flowing into eachother. What is this? I'm only 37 weeks so I feel like it can't be labor but idk how to describe all of this! Haven't called my dr I don't want to waste his time with something silly