You should always have a condom (or two) on you.
And Yes I agree with
Sabrewolfe, that you should just wait until both of you are sure you are ready. Its a big step in your relationship. After all, you haven't been dating for very long. And the more you know, and feel comfortable with one another, the love will be so much stronger and enjoyable. It will hold more meaning. That's what, I'm sure, you would both want.
Nothing wrong about waiting until marriage though. You have a strong moral conscience and that's something to be admired. She might want to save herself for marriage, and you seem like a very understanding person. That could be one of the reasons she likes you so much... But always be prepared, It is only being smart and responsible at any age.