I had one following IVF treatment at 7+3 I think it was. (Included at clinic as part of IVF treatment, though I would have paid for one around the same time if it wasn't) I don't think you can see much before 7 weeks tbh. I saw a blob with a heartbeat which was reassuring enough for me. After that I was referred into mainstream antenatal care. Congratulations btw!
Have you asked if you could have an early scan on the nhs? My GP phoned the EPU and requested one as I had 2 mcs last year and they agreed, I'll be 7+4 (I asked for one around 7 weeks). Might be worth a try?
I had internal scan at 6wk (GP referred me as light spotting) and nurse said everything looked as it should and she could see tiny flutter of HB but was too early to really say if viable, so going back next Monday when I'll be 7+3.
it's an IVF pregnancy so having viability scan at clinic anyway at 7+5 - these two at the EPU are extras due to spotting.
Congratulations! I had one at 8 weeks (for reassurance after a previous mc) and you could see the heartbeat and check everything was the right size and place, and it didn't have to be internal (although might be different if it had been on the nhs). I decided on 8 weeks because I wasn't totally sure on my dates and I read that if you see everything's ok then, and the hb, your chances of a successful pregnancy are pretty high, I think somewhere around 95%. It was very reassuring, definitely worth it!