Aren't you the 15 year old? You are TOO YOUNG for sex. You are not going to be old enough for sex until you can handle the negative consequences that are associated with sex, such as an unitended pregnancy or STDs. After one week, I doubt you even know this girls position on what course of action to take should she get pregnant, and I doubt you can afford for her abortion if she wants one. You definitely can't afford a baby.

One week is a drop in the bucket time wise, and here is a little tip about your friends: life is not a Jerry Springer episode, and sex is a private matter. It is none of your friend's business whether or not you are having sex.