We are at 9 weeks 3 days.  My uterus is 3.5 inches below my bellybutton.  Which, according to your pregnany week-by-week, is the 13-14 week measurement for a singleton pregnancy.  I have been wearing maternity pants non-stop (except for bathing and sleeping) for the last 2.5 weeks.  One occasion I wear maternity shirts.  I’m not fully ready for the shirts yet.  Can’t really fill them out, except for one that my friend had.  The label inside designates it as maternity.  Maternity for a nine year old maybe.  There is MAYBE 2 inches of extra fabric around in that thing.  I don’t see how anyone would be able to wear it past 6 months tops.  Transitional pants aren’t really a problem,  Its all in the shirts.  I could go out and buy some large size shirts that would work for now, but from my understanding, the double maternity wardrobe I have (mine and my friend’s) will not get a twin mother through the end.  I would already be purchasing more clothes in the last trimester as it is.  Sigh.