Help!

Has anyone else been told their fundal measurement is behind compared to what it SHOULD be? I had an appointment yesterday and I’m in my 27th week but my fundal measurement was only 24. My doctor didn’t seem concerned at all and said that it’s probably because I’m tall (5’10”) and have a long torso but she scheduled an ultrasound for my next appointment in two weeks just to make sure everything is going well. Anyways, I was sort of thankful that I wasn’t showing much up until recently but now I’m super paranoid about it. Justified or no?