Fetal HR Question

Sally

I had a 7w ultrasound today and the HR measured slightly slower than it did at my 6w U/S. Does fetal HR fluctuate throughout the day? Last week it was 143 @ 6+2 (which seemed high), today at 7+1 it was 134. Is this normal? Looks like it still within normal range but I thought it was supposed to increase. All other metrics look good!

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