You could be getting sick. I'm only two weeks behind you, And I had that this morning. I went to see my doctor and he said that I wasn't in labor and my cervix was almost completely closed but that I was sick sick with something. I'm currently on bed rest for the next couple of days.
I have had that and I rock me hips around or back and forth. My dr said to do squats it will help relieve the pain down there. And I'm at 37 weeks and three days