IVF clinic does them at roughly 7 weeks. By that time, allowing for some natural variation in growth rates, you should see a heartbeat.
Do you need a dating scan, or is it just to see?
I had one at 6 weeks exactly, saw the heart flickering away, but it was to small to measure accurately. Had my repeat one at 8 weeks, it was fab, saw bub and heartbeat was 169 bpm.
But about 7 weeks on is good.
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