I'm 18 years old and have been using a diaphragm for the past six months. If I keep using a diaphragm for the next few years, while I continue to grow, will I have to start using a different size? How will I know when I the size is no longer right for me? I got fitted about 6 months ago, and it seems to be fine, I'm just wondering about what I should do in the future and if the diaphragm is actually the best choice for me. Would love to hear other diaphragm users' experience.