I have had T1 since 14, now 25. I have a 3 year old. I did have on major complication, I am on an insulin pump and the cannula kinked when putting a new one in one night. Rushed for c-section the next morning.
So if you are one insulin pump, watch closely for rises and try to correct fast. Other than that my A1C stayed between 6-7 the 7 months, I added vitamins into my daily routine. Saw my high risk ob every six weeks, even being premature she was fully developed (lungs and all at 31 weeks) only this she needed was sugar iv supplements because my BG was high for 12 hours.
Best of luck during your pregnancy.