Fetal Doppler

So we purchased a top of the line doppler. I can hear a heartbeat way down on my pelvis line but it doesn't sound as fast as I expected. I put Doppler right over my heart for comparison and it doesn't sound like that either! My heart sounds like it's beating almost faster then the one I heard below. I am 10 weeks today. Here is my Doppler. The HR on screen kept flashing between 158-200 BPM!