In Canada, with a 'normal' pregnancy, scans are covered by our government-funded medicare for 11 weeks and 20 weeks. It's entirely possible if you're under the care of an OB you can request more scans than that, and I know for sure that high risk pregnancies get more scans than that. With my twins, after my first 11 week scan when I found out there were two babies, they started scanning me every week to keep an eye on them. If I'd known I had twins earlier than that I'm sure they would have given me early scans as well.
Since I use a midwife, the general procedure is - call them when you get pregnant to book your first appointment for about 10 weeks. Then you just sit and wait and hope that things are ok. When you finally meet with them, they book your 11 week NT scan if you want one. Since I'd never had a m/c before now, the 10 week wait was frustrating, but not scary. This time things will be different. Again, if I had an OB maybe I could request an earlier scan, but a midwife doesn't even meet and talk to you until you're 10 weeks along. Since my non-OB family doctor is taking such an interest in my case, though, he might be willing to requisition an early u/s after I get my BFP if I tell him how nervous I am. He's kind of clueless in the world of obstetrics and does whatever I ask of him! :rofl: