First Ultrasound High Heartbeat?!? Help

This is my first child so I'm looking for anyone who can shed some light or possible similar situations....

I had my first Ultrasound last week and the tech said everything looked good but the doctor just called today to say they want me to come back for another check because the tech recorded 220 for the heartbeat, and the normal high range is roughly 180. I measured at 8 weeks 3 days during the ultrasound but now I'm worried something may be wrong...

She did also state she had a radiologist review the ultrasound and pulse wave and he seemed to think the tech possibly just measured the wrong rate...

Has anyone else encountered this or had a high heartbeat count!? I really don't want to stress but I just worry about my baby now....

Help!!!