i started wearing sports bras all the time cause they dont ahev the cup size so it gives u a fair bit to grow b4 u need new ones. i think it was around 20 weeks i got the bonds bumps mat bras. they r sooooooooo comfy. i went from a just 14b to a 16d. i am pretty full in the 16d so i think i will end up in a dd if i grow even the slightest bit more.
just go shoppin and try on heaps see wat ur most comfy in but i do recommend sports bras till u get a bit further on so u wont haev to buy another set AGAIN.