My boyfriend dumped me after I told him I am pregnant..

So I just found out not to long ago I'm pregnant. I'm 5 weeks in; I told my boyfriend and he dumped me this morning.. I'm in this deep hole now...I've gotten preggerz before but I had a miscarriage. I'm worried that's going to happen again/: this is stressing me out because I'm in this on my own now! I have a job but I'm not financially stable. And I'm going back home this month for Christmas, then coming back to hi, although I don't have a place to stay. So I'm worried and I don't know if I should keep the baby): I want to so bad but I don't want to do this alone...I'm regretting ever meeting my ex because he just up and left me when I told him. I'm so upset but I'm trying not to be. I don't know what to do guys, I'd like some advice and such, that would be pretty great. I'm only 19....? I feel like I fucked up...