I remember getting my scan letter through for 13w from the hospitalat 11.5w and phoning because it said I had to bring my hand held notes from my mw appt...that I hadnt been told about which turned out to be (when I chased it) at 12w3d.
it differs everywhere. I didn't have to wait for her to ring. Told GP and was told to go to reception and make an appointment saw GP at 5 weeks and 1st appointment with mw was at 11 weeks they had avilable. Need to see mw before get scan date here
After I saw my gp it took 2 weeks for the appointment to come through by letter. the first booking appointment is at 13 weeks, so another 5 weeks for me. On the same letter was my scan for week 11.
I rang and changed both times as they were very inconvenient.