I was the same age as you when I got pregnant, and my partner - only a few months older than myself- wanted me to have an abortion too. I couldn't do it. We had just moved in to gether, like two weeks previously. He was not working- well not paid work anyway, he had taken a year off to work on his music.
Long story short, I told him I couldn't get rid of our baby. She is now two years old, we are married, and expecting our second daughter in about 6 weeks- (planned this time). My now husband was just in shock, and frightened and that was his first re-action- make it go away!!!!!, but after a couple of weeks- well really just a few days, he accepted I would keep the baby, and we'd see what happened.
It's a big piece of news to hear for anyone whose not expecting it. Give him a chanc to digest the information, and let him know if you have decided for sure that you are keeping the baby, and abortion is not an option for you.
That's what I did- I knew I couldn't do it, so there was no point in arguing about the question of it. I told him whatever he decided, I was having the baby, with or without him and I would release him from legal responsibility if that's what he wanted.
I told him I would choose my baby over him - it was true, I really would have.
Luckily, I never had to.
I hope everything goes okay for you.
Take care
el.