The main problem facing you is that only around 4% of pregnant teens graduate highschool. That means that only one girl out of every 25 will actually graduate. As such, you need all the help you can get, including your family just to make it through the pregnancy, so try to make it work.
Likewise, you need to at least give some serious thought to adoption, as you will have a rough time ahead as a teen mom. Even if your bf sticks around (i don't know his age, but the young ones have this habit of making themselves scarce after a few sleepless nights with a new baby), raising a kid when you are 13-14 years old is incredibly tough. No sleep, no money lots of stress, lots of having to take the kid to various doctors appointments even if it is healthy (and it gets much, much worse if it has some kind of illness). So you must have several people you can lean on for support if you don't want this to turn into an exhausting disaster, or else consider adoption rather seriously.
But if you feel up to it and are ready, just gather as many friends as you can and get ready for it. Parenthood is hard, but it certainly is possible to do. After all, most women manage it, even if most start a bit later than 13. Just be sure to gather strength. No smoking, no alcohol or drugs, lots of exercise. Labor is hard, and worse if you are not fit. But women generally report the result worth it :)
so please become a bit of a health freak right now, and it will be a lot easier in 7-9 months.