Okay so I endes my last menstrual period on September 15th then on October 10th I had a one day period and i was very confused as to why ... then on 16th I had somewhat unprotected sex . It was my first time. It was not sex all the way but there was a poing where there was penetration and there was pre him involved. I haven't gotten my period since and I was wonder if there was a possibility of me being pregnant or what was the reason for the one day period and why I haven't gotten my period since. Pleaseee help!!