help on contractions

Hollie • fire and blood

so I'm a ftm so every twinge I get I think omg this is it. anyway I'm lying on my bed and for the last 15 minutes I've been having a pain in my side by my ribs on the left kind of like a stitch but it lasts about 30 seconds goes and then comes back . is this anything to be concerned about ? I'm 37 weeks