I dont understand why she was living with you when you've only been together a month? That's a big red flag.

I'm sorry you've found yourself in this situation, but if you don't want a child there are options. Is she adamant on continuing the pregnancy?

If she does carry to term, I would also demand a paternity test upon birth. Whatever you do, don't marry her just because she's pregnant.

In fact, I would end the relationship entirely and only stay in contact so much as to determine paternity.

She does not sound stable enough to be in a relationship and there's no reason to put yourself through the kind of trauma this kind of relationship will cause.

Sorry it's not super positive advice. You deserve better than what she's putting you through.