I agree with @regina do not worry much because one day you are high, this is a background race, the important thing is that you are gradually improving in the controls.
I was gestational diabetic and my son was born healthy.Although in my case I controlled it only with diet.Sometimes I had glucose peaks but they were few and none went from 180. I already threatened the endocrine that if in a week I had two higher peaks of 140 one hour after eating, they would put me insulin.So I controlled everything a lot and yes, I also created a stress that sincerely I don't think it was anything beneficial.With specific spikes they told me there was no problem, that the problematic were continued levels. Stress suggests blood glucose.Checked.It is time to relax and trust that everything will be fine.