Cramping?

I know it's normal for some light cramping as the uterus expands but would it be a cause for concern if I didn't have that?? It's been about a week and I haven't felt anything. My symtoms as fatigue and nausea are horrendous and just so severe but just would like to know if it's normal not to feel cramping for so long. This is my second pregnancy and my first ended at 15 1/2 weeks so just curious. TIA!!