I've been having right side only pelvic pain for about a week now. I'm not supposed to start my period until Weds the 19th of January. I've only had minor breast tenderness but no other symptoms. Could this be an ovarian cyst or what could it be? I don't usually have problems like this so I'm worried. Could I be pregnant? I had sex only 11 days ago. Would I already be having symptoms? I do have A LOT of stress in my life right now.