Cramping....still

I am seriously beginning to wonder if I should go see a doctor just to be safe. I am 5w4d along and for the past 6 days have had constant cramping in my lower abdomin and lower back. It let's up, but only for a very short amount of time. I don't have an appointment set up until I'm 9 weeks. Should I make a trip to the ER or med express just to check and make sure things are okay?