Hey there!!! I got pregnant at 28 too, I am now 38 and my son is a healthy lovely boy. (of course, I had to mention he is lovely) Ive had type 1 diabetes since the age of 6 so I totally understand your point and concern. The first trimester of pregnancy is usually full of hormones which work in the exact opposite way than our insulin. Too high numbers can definitely cause some harm, in my case I had to work extra hours on my basal insulin requirements. No CGM at that time… You are perfectly on time to make some adjustments, I am sure you’ll be fine
You might want to take a look at some previous posts here in the pregnancy category
You are perfectly on time to make some adjustments, I am sure you’ll be fine 
