Becky, don't worry. I too was diagnosed in a previous pregnancy and it was a lot to get my head round. As with all things, the medical people tend to assume you may be stupid or reckless so stress the bad things that can happen in order to get across the message that you must control your blood sugars strictly.
You should have been given some blood sugar targets by your team. I'd hope you'd also have the number of a Diabetes Specialist Nurse who deals with diabetes in pregnancy. Mine was very useful early on when my blood sugars were all over the place.
When I went to my first hospital appointment, there were a lot of people there to see me! I found it reassuring though as it meant I was getting the best care. My usual diabetes consultant was there, as well as a consultant obstetrician. I've had excellent care from my team. My tip is to phone the DSN whenever you need to and, before you go to your hospital appointments, write down any questions you have, no matter how small.
Have you been prescribed a 5mg tablet of folic acid? You should have been, so chase that up if you haven't. This helps prevent birth defects in baby's spine and neural system. Every pregnant lady is at risk of those but if you have diabetes that risk is increased, hence the higher dose.
At the hospital clinic, see if you can speak to a dietician maybe. Has carb counting been explained to you?
It's a lit to take in, but the basic thing is simply to try to keep your blood sugars within range. You won't manage that all the time, but that's what you should aim for.
*after a low, your blood sugars may 'rebound' and go high, but the usual reason for a high after a low is over treating the low - that is, eating too much! I was told to correct a low with two or three glucose tablets, wait 5 minutes, test again, take another tablet if necessary, then have a SMAlLL amount of longer acting carbs, depending on when your next meal is. If you're about to eat, then just have the glucose tablets. You'll learn what your body needs in pregnancy.
Please ask as many questions as you like and people here will be happy to answer. Also, check out the Pregnancy section of this forum with the Search facility, or just have a read through of the threads whose titles seem relevant to you.