Anyone feel like they are about to start cramping constantly?

Rachael
The last few days I have felt my uterus like I used to about a half hour before I would start cramping. It's been almost constant and today it's making me really nauseous. Is this normal? Is it because it's growing? Blah. It's exhausting. Every time I stand for any period of time my thighs and pelvis is shaky.