Try not to beat yourself up too hard about the swings! I’m sure you are doing all that you can to control them as much as you can and that is all anybody can ask of you. You’re human and pregnancy alone is stressful, let alone trying to balance it with type 1 diabetes!!! Though the guilt may be hard to deal with, in my experience when I was pregnant, stressing myself only made my sugars worse and I was a total basket case about them.
If it would make you feel any better to read, I had an extremely challenging pregnancy with swinging sugars throughout and even an emergency appendectomy at 13 weeks which complicated keeping my sugars under control even more, but everything wound up okay!! I made a post about it a while back, if you’d like to give it a read. (Though I forewarn you it is a little long lol) the link is here - http://t1n-migration.10uplabs.com/groups/diabetes_and_pregancy/forum/topic/t1-pregnancy-success/
I had a bad blood sugar low one time while I was pregnant that went all the way down to 22! I frequently hit the 40s and even saw the upper 200s too. The guilt was almost unbearable!! But ya know what? My baby came out completely fine, weighed perfect, spent no time in the NICU, and is absolutely brilliant now at just 16 months she is quick as a whip!!
Hopefully I could ease your worries at least just a little bit. just remember again you’re doing all that you can and that is all anybody can ask of you. You’re human, not a robot! Nobody is perfect and don’t guilt yourself for it.