I don't know if it's too late or not, but after a rape, the thing to do is get a rape kit done. Even if you don't plan to prosecute at the time, this allows you time to change your mind (even if you're sure you won't). It's important to get it done as immediately possible after a rape. After a rape, one should not bathe, eat, drink, use the bathroom, brush teeth or wash. All of these can wash away evidence.