Confused and kinda scared ?

Shelbie • 02.03.2020👼🏻 04.28.2021🌈💖03.14.2023💙 04.03.2024💙

When I went for my ultrasound in September my baby’s heartbeat was at 167 bpm , the fetal Doppler says I think highest I had it was 132 bpm, do I have it in the wrong spot or do they not accurately tell the heart rate ?