I am 18 years old and sexually active with an older guy. We never use protection(we both get tested regularly), but anyways...My period came on the September 4 and finished on the 9th, then we had sex everyday after. On the 11 and on the 13th he ejaculated inside of me. About 10 days later I experienced a slight bleeding that lasted for about 3 days. 2 weeks before my next period was due. And I am always regular. Now its the day of my period and I am experiencing occasional spotting. Could it be that I am pregnant?