My blood sugars seem to rise, and my endocrinologist said it's because during your cycle you cells try to become insulin resistant.
I am assuming that you are referring to your menstrual cycle. For people with diabetes, it is common for blood sugar levels to rise during the premenstrual phase, due to production of hormones that oppose insulin's action. For those who don't have diabetes, the pancreas adjusts by secreting extra insulin, so blood sugar should not rise.