Crystal,
We all worry about things like that but from everyone that I've spoken to on here, Sometimes symptoms come and go, some days you will be nauseous some days not, same with any other symptoms, Personally my breast tenderness has done the same thing, some days it is severe and some days i forget I'm pregnant. I think its from your hormones. Just try not to stress out too much over anything, I know its hard, I'm having the same issue worrying about every little thing.