Pregnancy symptoms went away?

Hi all...I am probably being paranoid but I am (estimated) around 5 weeks, and I feel like most of my symptoms have disappeared. My HCG levels have been right on target (217 on 6/6, 697 on 6/8, 1744 on 6/10 and 6914 on 6/13), but I am worried about the lack of symptoms. I have an ultrasound tomorrow to verify that the pregnancy is in my uterus (I just had an ectopic in March so they're monitoring very closely), I am really nervous. Has anyone else had symptoms go away and been fine? Or had them come and go?