When I was pregnant with DS1 I had one. I was 8 weeks pregnant. I had no pregnancy symptoms and felt absolutely no different. It was 2 days before OH and I got married so we wanted to make sure all was well before announcing it at the wedding. It was about £80, but well worth it in my opinion.
I had scans at 4 & 5 weeks as I had pain but they couldn't see anything "unusual" so I got sent on my way. I'd quite like another scan soonish as the pain is back in really intense spells so I want to know what's going on without pestering the early pregnancy unit again. (I felt stupid last time)
I had an early scan at 7 weeks, everything was fine. The day before my 12 week scan I miscarried. I think in hindsight I would have preferred not to have seen the heart beat at 7 weeks, but it's a personal choice.
I've had early scans in all of my pregnancies. Two gave me bad news, one showed me a tiny blob with a flickering hb that became my dd.
I'm currently ten weeks and have had two at my EPU so far (they saw me as my last mmc was only at Christmas), and have a private one booked for next week (only a week before my dating scan, but we are staying with relatives at Easter and I won't be able to conceal it so want to be sure things are still ok before we tell them).
I suppose, that's a long winded way of saying that, yes, they can be reassuring, but the reassurance for me is pretty fleeting and my anxiety ramps up again before the next one. That may well be I've had previous mmc and I am also 43, so higher risk.
I didn't have a early scan, but I had an early gender scan and that was fantastic! For a peace of mind, go for the early scan to relax yourself, because the more relaxed and happy you are about the pregnancy, the more positive you become about it!
I've had two in this pregnancy, one at 6+4 (epu) and one at 8+1 (private). It was great to see the progress but I can't say it's made me worry any less as I'm still terrified of every twinge and pain. I will get another in a few week's which will no doubt keep me happy for a few days until the fear comes back again.
I had one at what worked out at 5 weeks due to bleeding (not loads) and one 10 days later which showed fetal heartbeat. Im 22 weeks now and had 6 so far (most recent being yesterday as i think i have a stomach bug) made me worry less and keep me in positive mindset
I've booked a private scan at 8+2, partly because I have a family spa day at 10 weeks and want to know it's all ok before I tell people, and partly as twins run in my family and I really want to know if there's 1 baby or 2 before I start buying bits. There's a nearby babyshow when I'm 12 weeks and I want to go and know.