Snack Question

I am confused with the snack rules an the don't inject for anything under 1cp.
I had breakfast at 7am and BG was 10.8, at 9am my BG was 10.7, had a 1cp snack and my BG is now sitting at 17.2!!!

At the end of the day, the DAFNE rules, aren't rules as such, but guidelines. Everyone's body responds differently, so if one of the rules isn't working for you, then do feel free to make the necessary changes to accommodate what you observe. Some people are super-sensitive to even small amounts of carbs, while others aren't. That can vary even in the same person depending on time of day, season, activity levels, sleep levels, menstrual cycle, whether the body is fighting an infection etc.

On my DAFNE course, I was told that my breakfast bolus was too low, and to increase it. That quickly proved to be wrong when I ended up having a hypo lasting over an hour with many, many carbs consumed during that period :-) At the end of the day, it is trial and error, so use the rules as a basis and deviate from them where necessary