"Morning Sickness" Gone

I'm getting worried.  From weeks 4-6 I was insanely sick, I even missed two days of work. Saw my dr on 6.5, and talked about it....will probably last until 12-14 weeks, it is the growth hormone, etc.  
The next day, and everyday after (today makes 4 in a row), I'm not sick at all!  We did a v-ultrasound and everything looked good, size, heartbeat, etc.  But I'm freaking out that overnight my sickness went away.  I'm worried it stopped growing?
Anyone have a similar experience?  When and how did your sickness go away???