That's unfortunate. Don't make any rash descisions however: boyfriends and parents do have a habit of coming around eventually. Hopefully yours will too. Explain to them that at the minute, you need their support more than any other time in your life. It'll be hard for them too: this could be a reaction born out of shock. If keeping the baby is what you want to do, dont let people persuade you otherwise. I'm not against abortion, but if you do choose that path you have to be 100% sure it's what YOU want, or you will regret it for the rest of your life.
It is possible to have a baby and remain in education. I do. However I have a fantastic support system which makes it a lot easier. Still, there is a lot of help out there, to encourage young girls in your position to stay in education, more than you'd expect at first. There are hostels & places you can go to especially for young mothers: there is also the fantastic School Age Mums project which will pay for your childcare during schooltime,this applies for girls up to the ages of 19. There's a whole plethora of people out there to help, if you want to keep your baby. If you do, and your parents do throw you out, get in touch with your local Barnardos ASAP, they are brilliant at helping you out, and they won't see you on the streets. There are ways and means of making it work out for you. Don't forget that whether he likes it or not, your OH will be a father, and if he's a decent guy he will stick by you.
Like I said, get in touch with Barnardos, or some suchlike organisation-google it, there should be one in your area. And meanwhile, sit your parents and bf down all together and have another talk with them about what you want to do-don't let them beat around the bush! Good luck & let us know how you get on
PS. Check out this site as well: might find some useful info
http://www.ywca-gb.org.uk/youngmums/links-campaign.asp