A.T.
Technicians are NOT doctors - and really aren't supposed to comment at all because of that fact. Call your Doctor right away and demand - don't ask for a review of your US right away - don't wait 3 weeks.
If there's a problem the sooner the better for a plan of action.
There is probably NOTHING wrong so waiting 3 weeks will just stress you out and possibly cause an issue from the stress and lack of sleep.
We were told by our tech that the liver(maybe kidney) was off in size. My OBGYN was really mad that she said anything to us - we went back in for a 2nd US 2 weeks later and everything was normal. 2 of my friends were told by techs that the baby had signs of Down's Syndrome - totally freaked them out - nothing was wrong in either case.
Hang in there - calm down and breathe and be aggressive with your Dr. to get answers - this is not a time to be soft spoken and patient.
Go get 'em!
Pregnancy is the most terrifying roller coaster ride I've ever been on. They don't tell you that in the books!