In agony after sweep

Im 40+3 and had my first sweep about 3 hours ago. I had a backache before hand but now my back is in agony and have a constant cramp that intensfies every few minutes. I dont notice tightening with the cramps but my stomach gets a lot harder. Im 2cm, could this be the early stages of labour or is this normal after a sweep and should hold off going to hospital?