You can only double count the babies' NICU time if you're looking at the average baby per week. We averaged 0.048 babies per week, as opposed to the baseline 0.025 babies per week.
Well full-term is often given as actually being 37-42 weeks, with the due date estimate being 40 weeks (not 9 months), making 42 weeks a normal(ish) pregnancy duration.
Not that I want to derail the well-wishing!
42 weeks overall
4.33 weeks in a month
42 weeks -> just shy of 10 months
I'm not so sure if you are ahead on weeks. But you are ahead on kids! Congratulations and good luck