Cramping in early pregnancy

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Who's currently between 4 to 6 weeks and experiencing cramping? Or has previously experienced it? I'm 5 weeks and been cramping on and off even before my bfp. I'm just concerned cos i expected the cramping to stop at some point. When does it stop? There is no bleeding but sometimes the pain is bad, sometimes its just twinges. I'm only going for my 1st scan in a week's time.