I wouldn't be worried & it's unlikely to be a mistake. If the heart rate was regular, strong it's all okay. A fetal heartbeat at that gestation (as all) will fluctuate and change. Depending on movement, what the mother has or hasn't eaten etc etc.
Thanks for your replies ladies. She will have another scan next week so only time will tell I guess. Bubs is measuring well so that has got to be a good sign.
This has been a very long awaited pregnancy and I want so badly for everything to work out well for them.
At my 6 & 12 week scans with this bub it was around 125bpm. Completely normal and nothing to worry about.
ETA: then at my 20 week scan heartrate was 167bpm.
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