Many of us find we need more insulin in the days before menstruation, it's very common!
For me it's the other way around, I drastically need to reduce my insulin doses before that time of month, or at least I did until recently. I'm 47 now, and periods have been rather random, and so have their effects in the last 6 months.
I adjust my doses as soon as I see it's one of those days.
You might want to contact your diabetes nurse on how to adjust your basal insulin and/or insulin to carbs ratios on those days.