Worrying again :(

A lot of the time the measurements can be off by a couple days (sometimes even a week or more later in pregnancy). The scan is not 100% accurate.

As for the symptoms, it's perfectly normal to have symptoms that come and go. Sometimes you might not even get any symptoms during the entire pregnancy. With my two girls I had horrible horrible morning sickness and every symptom in the book, with my son I had nothing.

stay positive, symptoms might vary

The only thing that is best not to do is worry. Because the more stress you experience, the worse your child is. Always think positive!