Feeling so guilty

I finally got my numbers under control and have had a full week of zero spikes. My OB told me that I could treat myself to Starbucks once a week and not to worry about it, but I tested at 1hr and was at a 9.6. I had the same drink last week and didn't spike. I tested again at 2 hours and I am back down to 5.1 but seeing that 9.6 made me feel terrible