The last time I had sex was August 13th and it was protected. I had my first period from August 22-26 and my second period on September 21-25. My period for October was supposed to start the 22 but it's about to be 3 days late tomorrow. Could I be pregnant? I started receiving backaches and and what I thought were cramps but nothing ever came. I've been dealing with IBS for a few months now and also a lot of stress from my classes and relationship and my parent's divorce. So I'm not sure what's going on. I went to the doctor on campus and she gave me Dicyclomine for my IBS. I'm not sure if that's causing something. I don't feel queasy or my boobs don't hurt on anything. I'm just tired. Any help?