My insulin resistance started at around 18 weeks (I can't remember exactly) and did another jump around the 22 week mark (again only a guess). It freaked me out at first - how quickly I had to increase my insulin. I usually waited say 3 days to check it did really need increasing and wasn't a one off. I had to increase my basal significantly and my ratios went right up too.
You may have to change your breakfast or bolus more in advance. Also, do you count any carbs for the peanut butter? I find that can put my sugar up even now and even in small amounts.
I think you have the choice of keeping the same breakfast and making adjustments to your insulin and timing; choosing a lower carb bread and trying that; or choosing a different breakfast. I did have cheese on toast a few times. I also found I could have a croissant, either with butter and a scrape of jam, or filled with bacon.
Hope that helps. It sounds like your working very hard to keep good control
Edited to add - I also tried rye bread, ham, cheese and red pepper. That was quick to make. You could also add a hard boiled egg (boil the night before)