Patient: I’m 18 years old and am concerned that I may be pregnant. My last period ended on January 9th and I had protected sex (with a condom) in the week that followed. I haven’t had sex since the 14th of January (the Saturday after my period ended). I heave yet to get my period again and am growing very nervous. Up until June of 2011 my periods were very irregular and sometimes are still off by a few days. I have not experienced nausea, backache or bloating. What are the chances that I am pregnant?