Up and down symptoms

I am starting to become worried after having quite a few days of nausea, and now I haven't had any in a few days. Do symptoms really fluctuate that much for days at a time? Should I be concerned? I just went in last week for the ultra sound and saw the baby's heart beat and everything, and am not schedule to go back until next week...

    When I was pregnant I would have morning sickness one day and not the next, 3 days later morning sickness again from 9 weeks till 13 weeks and then it went away.
      Thanks for all of your stories, I'm just so new to this pregnancy thing :)
      About Shelley
      Born: Bloomfield Hills, Michigan
      Current: Bloomfield Hills, Michigan
      Birth: May 07
      On Moms.com since: Nov 13, 2013