I am a sexually active woman. I had an intercourse with a man on sunday 27th August 2017 at around 8pm and it was unprotected. He pulled out right before ejaculation but from yesterday I am feeling quite nauseous and I am experiencing discomfort in my abdominal region. I had my period this month from 12th August to 16th august and still 11days are left for my next period according to my period tracker. Is there any possibility that I am experiencing all these because there is a possibility of pregnancy?