My best advice would be to manage to get your sugar level under control (which you are already planning / trying), then manage your diet carefully and monitor your glucose levels carefully and frequently. There is an amazing book by Cheryl Alkon's book namely "Balancing Pregnancy with Pre-Existing Diabetes” that shares a lot of info about what you can expect for conception and even as a pregnant diabetic.
Develop a strong medical support with a team of doctors whom you can trust 100%. You may need an additional tests, such eye examination, kidney examination, blood pressure check to ensure healthy pregnancy. Even thyroid testing and other medication adjustment is essential. With a good plan and dedication to eating right and staying healthy, your chances of giving birth are very high, despite a diabetes diagnosis.