when I was 6 weeks pregnant I started cramping a lot and it was very uncomfortable but there was no bleeding. I went to checked and I got a sono and that's when I found out I was pregnant with twins!!! The doctor told me that the reason I was cramping so bad was because my uterus was stretching twice as fast for two babies!!
ur body could be adjusting to not having that period. if its rough cramping i would call my dr just to be safe since its so early. On the bright side i felt period like pains for the first 3 months around thw time i wouldve gotten my period.