Hiya and welcome.
Many congratulations on your little bump
I know with a first baby you get about twice as many appointments than you do with following
I had a quick appointment with the MW at the surgery when I was about 6 weeks, then she came and saw me for my full booking in at 8 weeks, where she took a full medical history for me and DH and discussed some of the tests and other options available, it's a long one. I think some NHS trusts do the first scan anywhere between 10 and 13 weeks, so that could account for the early scan. Or if you are unsure at all of your dates, even if it's just because you've been on the pill or hinted at long cycles, they'll do an early scan to get a more definite idea of your dates for they're benefit.
Wishing you a happy and healthy pregnancy and looking forward to getting to know you during the next few months before you have a bum to clothe in yummy fluff