Hi! I agree 100% that hormone fluctuations can and do affect blood sugars. I’ve lived with T1D for over 50 years, so I know!
For me, about a week before my cycle would start I’d get an overnight low. After I got married my husband caught on to this. He’d get some glucose in me and tell me, “Your period must be about to start!” and we’d both laugh.
Anyway, more to your question, I would also find my blood sugars going high once my cycle started. So don’t fret, it’s normal!