Hi ladies, am 13 weeks today and about 4 o'clock this afternoon while at work I had some really bad cramping very low down in my abdomen. It lasted for about an hour or so, now it has moved up under my ribs and feels like a bad stitch. I can feel it in my back too. Had a nuchal scan yesterday which showed a happy, healthy and very bouncy baby but now am getting worried. Any help advice or reassurance you can give will be greatly appreciated xx