Moms of previous singletons and then twins...

I know the subject alone will narrow down people reading this, but if I still have your attention....   If you had a singleton that went post-term (40+ weeks), how many weeks were you when your twins were born?   I had my son at 41 weeks.   Wondering if I will hold the twins in until a scheduled c at 38 weeks or if I should expect them sooner.   Thank you ladies!!!