How big will my breast grow?

OKay so this is going to sound bad no lectures or anything because i already got yelled at and everything by my parents but im 15 and pregnant... yeah huge mistake.. but don't worry i am still going to school and everything still with my boyfriend (of 2 and a half years) and were putting the baby up for adoption so we can finish school and stuff.. but i am 5 weeks.. and i was just wondering since im already prego.. how big will my breast grow? im only 15 and about a 34B.. just wondering since im so young will they grow and how much did yours? im just curious..