Telling my parents and my brothers.........?

Im 15 and have been having with my boyfriend for a a couple of months. last night i found out i was pregnant, we have been using protection, so it came as a shock. I phoned my boyfriend and told him, he said he would stand by me whatever i chose to do. I terrified about telling my parents and my older brothers, im scared that my dad will kick me out and i will have to go and live wih my brother in New york, seeing as i live in England, i would have to leave everything. Can someone please give me some advise, i really need it.