I'm 18 years old and these past three months my period has been kind of off. I had sex for the first time July 31st. He used a condom. A few days after I started my period but it was a week early and it only lasted about three and a half days. Usually mine last about 5-6 days. My next period was normaland lasted 5-6 days but it was also a little early. The one I just had lasted only 3 days, it ended on this past monday (9/23). I've had no other pregnancy symptoms. Could I be pregnant? For two years now ive had a pretty consistant period, same time each month an same length. It may have varied a little over those two years but not by much. Someone please help I don't know what's going on!