Congratulations to being pregnant!
I'd say, talk with your parents, and his parents about this. If the people around you don't know, they can't help and support you either. They might get mad at first, but that will very likely change into being the proudest and most caring grandparents on the planet. 19 really isn't that young, i know someone who had a son just weeks after finishing junior high school. She was just about old enough to legally jump in between the sheets when she got pregnant. And today? She's doing really well.
Even if you and your boyfriend don't have jobs now, surely there must be someone around who can help you in the very beginning until at least one of you have a job. Living with parents... Awkward maybe, but just imagine the posibilities! That child will have his or her grandparents very close, and you'll always have someone to ask about baby care, and a babysitter around.
From what i can see in the first post. Both you and your boyfriend seems really happy about this pregnancy too, so if i were you, i'd go through the pregnancy. 9 months is a long time so there's still lots of time to find jobs and everything. And i'm sure you can get help from your families too. Who knows, if you abort this time, maybe when you are ready to have children, and want it, then it might be more difficult to get pregnant. My parents tried for years before they got me and yup, i have old parents

I mean, how fun is it to be 23 and have both parents being well over 50? From my experience i can say it's no fun at all! I don't know how long i'll have them around, or if my children in the future will have their grandparents around for long. Thinking about that saddens me everyday, and sometimes makes me cry too.
Think carefully before you decide what to do. But from seeing how friends have taken it, an abortion is really really difficult! I'd NEVER want to go through an abortion unless i got pregnant from being raped or something like that.
If your A1c isn't brilliant now, but okish, it shouldn't be a big problem to carry the child, if you A1c was a disaster you'd probably not have managed to become pregnant in the first place. Just make sure you get a team who knows how to deal with diabetic pregnancies if you decide to become a mum.