Divvy,
I was about a size 8/10 when I fell pregnant... Usually I was a 10/12, but I had been eating little & partying hard o/seas!
When I came home at 21ish weeks, I was still in my normal jeans, but it was like as soon as i told everyone I just blew out!!!
I usually had a full perky C cup, at about 7/8 months I got fitted & had to have special orders also for G cups... When my milk came in, I had no room in the bed for me anymore!!!
I ended up going down to 48kg about 6 weeks after DD was born & my breast are now a flat, floppy, saggy, patty cake C Cup, I am now a 12/14... I hope my breasts don't get that big again, I could not sit at a dinner table!!!!

There is a good Maternity clothes shop along Canterbury rd in Heathmont... can't remember the name but they have specials regularly!!!