I had one at 6w1d and saw a lovely little blob with a heartbeat. I went again at 8 weeks exactly and already bubby was growing limbs - it was amazing to see the difference in 2 weeks!!
Good luck for Wednesday. I've read that the earlier they do it, the more accurate it is for dating. But if you go too early you are less likely to see the HB and that can cause worry. Mine was done at 7w2d, which is standard for my IVF Dr. 6wks seems to be pretty standard for a dating scan.
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