And remember that T1 diabetics have been getting pregnant for the last 100 years and there weren't any glucometers for the first 60. Speaking as the daughter of a T1 mother who managed her pregnancies without a glucometer. And I don't remember this amount of obsession with levels when I had my two T1 pregnancies. (Though I did discuss whether my control was good enough before both pregnancies, I actually pre-empted the permission with my second because I'd already decided that they were good enough.)
So yes, the statistics look slightly better if you keep your levels in the recommended range and have the required hba1c before pregnancy, but plenty of T1s have had successful pregnancies with initial hba1cs much higher than 55. (I think of it's really high, above 80 or so, they sometimes recommend that you don't proceed with the pregnancy.) Every pregnancy has a small risk of miscarriage, whether the mother is T1 or not, the risk goes up very slightly if you are T1 and is minimised by optimising your sugar levels.
But try not to stress about not being perfect, no one is (well maybe some people are, but I haven't met them). Just do the best you can.
Good luck and congratulations on the pregnancy.