my last period was on the 16 of december 2011. i had unprotected sex on the 25th of December 2011 and 15th january 2012. what are the chances of me being pregnant? im freaking out. also i was in a very stressful life threatening situation on the 8th of January 2012. combined with all this, im 12 days late...., what are the chances of pregnancy? i do not want to be pregnant and im really worried... HELP