I am afraid that this is not enough information. The girl is two years younger with you - that is fairly standard. You have dated for a week - that is not a lot. then something happened but you are not saying what. And now you are trying to sort it out, but it is not clear what the "it" in "sort it out" is. So on the most general level, the fastest way to get through "this" for you and the girl is to talk to define what "this" and "it" mean to each of you. Once you have some clarity on that, you can decide what your next steps could be. It is possible that the "it" is different for her and for you - talking about "it" would clarify what "it" means for each of you.