Girdles Movies Looking For Name Movie(TV, Canada?) Girl Gets Pregnant, Hides Until Birth(on Prom Night?). Shoplifts Girdle.?

Looking for name movie(TV, Canada?) girl gets pregnant, hides until birth(on prom night?). Shoplifts girdle.? - girdles movies

I only know that it was someone she was pregnant, not even her boyfriend calls (the poor, he was rich). She had a brother, I think.
In a moment that the size of the tent and was stolen as "shoplifter.
He held his best friend ...
I really want to see!
In 80 or 90 must be rotated.