pregnant and terrified

Catrina
My fiancé had major back surgery that ended in him being permanently disabled with chronic pain. I'm 20, he's 22. He developed an addiction to pain killers and every attempt to cut down on them has lead him to fill in with Xanax and sometimes cocaine and he runs out of his prescription early. I told him last month that if he didn't go to rehab I'd leave him. I found out I'm pregnant 3 days ago and told him. And he's excited, and says the right things. But his mother is also addicted to pills and supplies him with them. My family says they'll support me, but they are very concerned about him being involved. I'm lost. I doubt I can live with myself after an abortion. And it would kill me to hand my baby over to someone else. I can get my aa in a semester but I'm not sure how to go about getting a job that will support us. I wanted kids with him months ago but he's deep into addiction and this was unplanned. I'm so scared to be a single mother. Terrified that I will never have the future I wanted with a happy marriage and a house and being able to stay home with my kids. My head feels fuzzy I can't even think straight.