Hiya. Congratulations. It's a mad, exciting and worrying time!
With me, I had a good diabetic team and had already met a midwife who dealt with a lot of type 1 and 2 diabetics, and ladies with gestational diabetes (me and my husband had been trying for over two years, so I'd had a few appointments with her before I got a positive test result).
Once I found out I was pregnant, I emailed her and she arranged a six-week scan for me. After this internal scan and a viable pregnancy was confirmed, she told me I had to arrange an appointment with a midwife at my GPs so they could arrange a booking appointment. This is done when you're at around eight to ten weeks pregnant and all they do is take a few blood tests, weight, blood pressure. They also ask lots of questions (it's a bit of an admin appointment to be honest) and start your maternity notes off - a folder you keep and bring to all future appointments. From here, you get a booking scan appointment in the post and an appointment to see a consultation - with me, this is the antenatal diabetes clinic. They keep you right and tell you which "non diabetic" appointments you still have to make at your GPs, like the 16 week check where they listen for baby's heartbeat.
That was my experience 5 years ago when I was pregnant with my son. I'm 13 weeks and two days pregnant now, and it's pretty much the same now. I had an early scan at eight weeks, booking appointment at ten weeks and a scan last Wednesday to date the pregnancy. If you don't have anyone to contact with your diabetes team, ring your doctors so you can get in the system. All you need to make sure you're taking is folic acid, the bigger dose for diabetics, which your team will arrange asap, and try and keep your levels in the best control as you can. This was a mare for me both times, and again when I misscaried four and a bit months ago, so it's hard, but help is out there.
Hope this helps and good luck.