Keep calling, or if it's close enough go to the med recruiters office. Three semesters, is just over a year. It will take you nearly a year of not longer to get through the selection process, so now is a good time for you to start. Be warned, the process is long, tedious, involved, some what time consuming, and there is a lot of "waiting to hear." there are many things that can cause you delays so you will need to stick with it, if it's really want you want.
Hang in there, and visit here often and keep us informed on your progress. Good luck