if you still have your I-94 and I-20 forms, and everything related to the fact that you have D/S in your I-94, you can do CP. Keep proof of that I-94!!!
if you have never contacted USCIS for anything after you fell out of status, and you were never officially found to be out of status, then you didn't accumulate any illegal presence (yet). Which gives you a chance for consular processing (not AOS).