Heart rate at 11 weeks

C • •Married January 6th 2018 • Expecting January 5th 2019• 💕❄️✨

Hi ladies! I’m probably overthinking. When I went to an ultrasound at 7 weeks, 5 days my baby had a heart rate of 166. Today, I met my OB and she used the Doppler at it was 113. Is that low? Are Doppler’s different than ultrasounds? I also hadn’t eaten today (due to sickness) so maybe my sugar was low? The doctor didn’t seem concerned (and was happy to even find it with the doppler) but now I’m mad at myself for not re confirming it was ok. Thoughts? Experiences?