I was pregnant when I was your age. We parented the child, got married and have pretty much lived happily ever after. Corny, but true.
However, there are a LOT of sacrifices to be made when you are a teenage parent. I prefer to use the phrase "being a parent" than "keeping the baby." IMHO, the former does a better job of addressing the lifetime responsibility while the other sounds like you're keeping a doll instead of taking it back to the store. You'll be a parent long after your child has stopped being a baby.
Anyway, first thing, you are only 5 weeks along, so you have time to make a decision. There's no need for you to make a choice today, or next week. You sound like an educated and reasonable young woman, so do your research.
I believe the financial aspect of parenting is transient. There are many resources out there to help young parents, including aid to keep you in school. Once you graduate, you'll have your own money coming in. Don't let money be your only factor in your choice!
The better question is, are you ready to be a parent? It is, as I said, a big sacrifice, but it is incredibly rewarding all the same. I have no regrets with my choice. But I decided I was ready to parent. It's a question only you can answer.
I also ask that you consider adoption as an alternative to abortion. I know you said that if you go through pregnancy and labor that you wouldn't choose adoption, but please hold off that decision until you researched it.
ETA: I'm not suggesting that you make government assistance a way of life. The purpose of those resources are to give people some help when they need it. Use that help to finish school, then you won't need it anymore.
Good luck.