Heart rates different one week apart.. thoughts!?

Kristine • 🌈 💙

Hi everyone..

I had an ultrasound done at 8 weeks and the baby had a heart rate of 169. I went at 9 weeks and the baby measured perfectly but the heart rate was 163.... should I be concerned that it went down? Or is that just where the heart will be at this time.. any thoughts would be super helpful and appreciated!