I am going to have one tomorrow, I'll be 10 weeks 2 days. We're going on holiday next week and decided it would be really good just to know before we go whether everything is okay so that we can enjoy the holiday more and if things aren't okay we'll be able to use our time away to support and nurture each other. I am so anxious though!
I had one at 7+4 (I think) in hindsight I wish I had left it a bit later as I had a previous mmc where the baby had died at 8+5 and I think getting oast that mark would have been more reassuring! However I now have a two year old so we did make it in the end 😀
Best money I've ever spent! Just saw little baby for the first time at 10 weeks 2 days and it was very wriggly! I think I would have waited until 12 weeks if we weren't going away, but I feel so happy now, for me it was definitely worth going for an earlier scan.
I had my first at 6w5d to confirm the pregnancy, then I had two more at 8 weeks and 10 weeks due to bleeding. At 8 weeks when the bleeding started I was convinced I was miscarrying and absolutely devastated - went to hospital the next morning and was SO relieved to hear the heartbeat. My extra scans were covered by health insurance anyway but for the level of reassurance it definitely would have been worth paying for too.
I've had lots of early scans, all good but one pregnancy the baby was alive and seemingly well at 7 weeks but dead at 11 weeks sadly. So I think they can give temporary peace of mind but they are by no means definitive.