37 week growth ultrasound

I had a growth scan at 37 weeks pregnant and at my weekly appointment today I was told they would be calling me to go to a hospital to do another ultrasound because the baby’s heart was borderline large. At my 20 week anatomy scan it was normal, she said not to freak out that some ultrasound techs don’t do a good job so she wants one done at a hospital. Has this happened to anyone I am freaking out!