I have been on the shot for only about 4 weeks but, ive been feeling horrible...im wondering if there is anyway that the shot doesn't work correctly?? one of my friends said that the shot doesn't work correctly and that there are ways to tell. I was wondering if anyone can tell me if there is and what are they....bc she said that it sounds like the shot isn't working for me...and me and my bf had unprotected and he forgot to pull out....so im wondering...