I completely agree with JustLookin that a CGM is really helpful for achieving better control. Here are some other suggestions:
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The new book by Vieira & Smith is excellent. The first few chapters have a lot of good information and tips.
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Do basal testing, especially overnight. Similar to many women, I usually needed at least 10% more insulin than usual in the last week of my cycle and at least 10% less than usual in the first week. In pregnancy, my basals were high for the first few weeks (even before I really knew I was pregnant) but began dropping a lot around week 8. Your doses will change a lot in pregnancy but it’s helpful to start from a solid foundation. Surprisingly, A1c several months prior to conception has an effect on pregnancy outcomes, so it’s great that you’re serious about preparing in advance.
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Test your carb ratios until you think they’re correct. It helps if you prepare your own food and eat consistent amounts at similar times every day. It’s also helpful to keep detailed records about what you ate and whether the dose worked well or not (same with the timing of any prebolus). You seem to be aware that some doctors do not recommend low-carb diets in pregnancy. Low-GI foods such as legumes or whole-grain pasta might be a good compromise. If you have a pump, experiment with dual-wave boluses for these foods and for larger meals.
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I think many doctors encourage continued exercise, even running, during pregnancy. In the first trimester, it was very helpful to walk or run right after eating (to minimize post-meal highs) but exercise at other times was tricky because of my tendency to go low outside of meals. Glucose tabs became a staple for me, replacing other more-appealing candy that didn’t work as fast (but it’s important to be patient and not over-treat minor lows).
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Start taking prenatal vitamins. Folic acid is very important to take beforehand, even more so for diabetics. I wish I had kept a larger stock of test strips and CGM supplies on hand because in pregnancy I ended up using more supplies than my insurance company would pay for. Ovulation kits are also helpful once you get to the TTC stage.
Good luck! With a CGM and a lot of work, you can definitely meet your pre-conception A1c goal. I won’t say that blood sugar control is easier in pregnancy (in my experience it’s harder) but at that point you’ll be really motivated to put all of your hard-earned knowledge to work.