Cinnabon,
Since our endocrine system is a bit outa whack because of
diabetes, our hormonal balances are likely more fragile than folks without diabetes. I can't answer your question directly with a general rule, but I'll share my own experience with you.
I was dx'd in my teen years -- I don't remember exactly my age, but I think I was ~15. My periods were irregular when they first started and then I went many months without one.