Hi,
Only a few weeks to go, you must be excited! I am type 1, so have been on insulin since I was 4, and continued to take it during both pregnancies. theer is some data to show that insulin does not harm the unborn baby...but it is hard to find. Seriously, don't worry about that!
It sounds like you are doing a fantastic job of looking after yourself, and THEY (medical bods!) always seem to forget to say that. Personally, if they threaten you again, demand to see the top person. It does sound like they are being a bit jobsworth to me. The thing is, you obviously want to do teh best thing for your baby, and keeping the best control of your blood sugar is the best you can do. I do not know when is teh right time to start insulin, and if they do start you on insulin, they should give you a tiny dose, and make sure that this is OK.
Taking insulin should not be a threat, although having been on it for over 30 years, I can still see why it feels like this. If you need it, you need it, but I would certainly get a 2nd opinion is this is a seriuos suggestion. I know that sometiimes, it is used as a threat, becasue sadly sometimes people need a threat to make them look after the baby. Clearly, this does not apply in your case, I really admire how well you are taking control of this. It is hard enough coping with pregnancy, without learning all about a complicated condition like diabetes, take care, Jill