Fetal heart rate question

Amanda

Hey guys. So I just made it to 7 weeks but I had two ultrasounds last week due to me being so high risk plus I ended up at the Er for HG. My first ultrasound was on May 22nd and it showed I was 6w with 120bpm but my second ultrasound was on may 24th and I was measuring at 6w2d with 108bpm. Is it normal to have fluctuating heartbeats? My doctor told me the ultrasound looked fine and healthy but seeing the reports and two different heartbeats is scary. Has anyone experienced this at all?